Striated Pardalotes - juveniles

A juvenile Striated Pardalote - nominate Pardalotus striatus striatus

When we caught two young Striated Pardalotes Pardalotus striatus on the last trip to Charcoal Tank (see previous posts), I noticed that they were of different subspecies. The one above is of the nominate type striatus, which only breeds in Tasmania and spends autumn and winter on mainland Australia, where it overlaps the range of two subspecies, ornatus and substriatus. The nominate has yellow wing-spots, colouring on the tips of the greater primary coverts, while the subspecies have red wing-spots - see below.

The yellow wing-spot on the primary coverts of a  Pardalotus striatus striatus

The red wing-spot  on the primary coverts of a Pardalotus striatus substriatus
(The wide band of white on primaries differentiates this subspecies from the similar subspecies ornatus, which has narrow white edges to the primaries. See post of  17th September 2012)

A juvenile Pardalotus striatus substriatus

Then I noticed that the striatus juvenile's moult into adult type plumage was less advanced than that of the substriatus bird. In particular, its crown was still spotted rather than streaked like that of the substriatus (see below). This is only a sample of one from each subspecies, but I wonder whether the young Tasmanian striatus birds deliberately delay their moult until they have migrated across the Bass strait and settled in their winter range on the mainland. Meanwhile the resident subspecies of South-west New South wales, substriatus, begin their moult as soon as possible. Both birds were caught on the 15th March 2014. If the Tasmanian birds migrate from March-April (HANZAB), this bird would have been one of the earlier to leave. Would it have been one of the earlier to hatch too? If so the delay in its moult would be more likely a strategy to moult post migration. I would be grateful if anyone has more information on the plumages or migration strategy of juvenile Tasmanian Pardalotus striatus striatus.

Juvenile Pardalotus striatus striatus,
with a spotted crown

Juvenile Pardalotus striatus substriatus,
with a partially streaked crown

                               

Australian Emperor Dragonfly

While out at Charcoal Tank Nature Reserve, by West Wyalong, NSW last weekend, where we were catching birds as mentioned in the previous post, Tony Stokes found and pointed out a dragonfly which was perched on the trunk of a Red Ironbark while the sky was overcast and dull.

This was an adult male, identifiable as such by the pair of claspers on the end of the abdomen.

It was an Australian Emperor Dragonfly Hemianax papuensis, which is common and widespread throughout Australia, New Zealand, New Guinea and neighbouring islands. It is a large insect, about 7 cm long, with a predominantly yellow head, thorax and abdomen, striped with contrasting brown or black. The choice of a dark-barked tree for a roosting site showed off the yellow well, especially on the leading edges of its wings. While the dull sky and cool air kept it motionless, giving a chance to see the detail of the insect's intricate wing-vein structure.

Seen from an angle, the insect's aerodynamic form is perfect 

Young birds - how to determine their age

A young Striated Pardalote, less than one year old

On the last trip to study birds at Charcoal Tank Nature Reserve, NSW, over the weekend of 15-16th March, which was run by Mark Clayton as usual, we caught a variety of young birds. This was not surprising as it was only a month or so after the main breeding period for most birds in the area had ended, but we caught 26 species amongst the 119 birds caught altogether, and determining the age of birds can be tricky. So to help illustrate just how these young birds were identified, I have set out below some examples of the various methods that can be used to establish their age.

A front-on view of the same young pardalote

Immature Plumage -  The main, quickly seen features which were followed to determine this Striated Pardalote Pardalotus striatus as a young bird were the beginnings of only a few streaks on the crown and no white eyebrow behind the yellow flash above the eye. This bird will gradually moult out its first young-bird feathers and grow true adult-coloured feathers during its first year of life, with a fully streaked crwon and a wide white eyebrow.

A young Double-barred Finch

Feather development - To the trained eye, this Double-barred Finch Taeniopygia bichenovii is likely a young bird as it has narrower black bands across its breast than an adult would have. But that is a relative criterion, which is not of much use if there is not an adult to compare it with. More precisely, it can be aged as a young bird, less than one year old, by the incomplete covering of underwing feathers. In the second image, the flesh and line of the bones can be clearly seen because they are not fully covered like those in an adult bird. The most important feathers for a young  bird to grow are its body feathers for warmth, then flight feathers for mobility. The sooner they can leave the nest, the easier it is for them to escape from predators. So they gradually complete their body plumage in the less exposed parts, such as under their wings, as they continue to develop into full-grown birds. 

The partially bare underwing of the same young Double-barred Finch

A young White-plumed Honeyeater - in its first year

Pigmentation - this can be costly for a young bird to lay down, nothing comes without cost, even in nature. So young White-plumed Honeyeaters Lichenostomus penicillatus concentrate their nutritional resources in growing a basic bill, enough to serve the purpose of feeding, preening etc.. There is no need for deep pigmentation. That is added slowly during its first year of life, and by the following breeding season it will have a fully black shiny bill, a sign of an adult bird in breeding plumage.

This first-year White-plumed Honeyeater is probably a few months old and has begun to grow a dark bill,
 starting from the tip

Young Sacred Kingfisher - less than one year old

Buff-tips - many young birds have buff-tips to some of their feathers, such as this young Sacred Kingfisher Todiramphus sanctus, which has such feathers in its wing coverts and crown. Most of these will be moulted out during the first year, and the bird will be in adult breeding plumage in time for the next season. Some other species can retain a small number of these buff-tipped feathers into their second year while they are breeding, but if a Sacred Kingfisher has lots of such feathers between breeding seasons, then it can be confidently classified as a first-year bird. 

A back-view of the same kingfisher - this bird has a broken tail feather, snapped along the line of a fault-bar. This is a weak part of the bird's tail feather which is a result of less keratin being laid down in the feather during a period of less nutrition intake as the young bird's tail grew

A young rainbow Bee-eater

Ornamental feathers - or lack of.  Some species of birds grow elaborate ornamental feathers as part of their adult breeding plumage, like the Rainbow Bee-eater Merops ornatus which have extended central tail-feather streamers. The young birds however, do not grow these. To grow such feathers for no purpose in their first year, as they are only required for breeding display, would be an excessive waste of nutrition. 

Gang-gang Cockatoo Survey

An adult male gang-gang inspects a potential nest hollow

Today saw the launch of the Canberra Ornithologists Group's Gang-gang Cockatoo survey. The survey organiser, Chris Davey introduced the project to a group of birders at Corroboree Park, then naturalist Ian Fraser added a few details and anecdotes to inspire people to go out, find the birds and log their results in the online survey - http://canberrabirds.org.au/observing-birds/gang-gang-survey/. All records of Gang-gangs in the ACT and surrounding district are welcome, including negative ones, and there are already hundreds entered. The project runs for eighteen months to cover all seasons fully and we hope to have a clearer picture of where the birds breed, overwinter, and what habitats need to be preserved if the birds are to be here in the future. So if any one in the area can add information to the survey please do, it's easy, and rewarding. 

I was involved in the design and production of the survey brochure, a fold-out introduction to the bird and project. See below.

Huge deposits of pumice on the beaches

Piles of pebbles of pumice lie on the tide-line along the new South wales south coast

The sandy beaches and hidden coves of the New South Wales south coast are presently littered with pumice pebbles. They have come from 4000 km out in the Pacific Ocean, north of New Zealand, where a submarine volcano on the Havre Seamount, near the Kermadec Islands erupted last July. This caused a raft of pumice covering 20,000 sq km to form and gradually drift west on the currents. When they reached the Australian coast they were washed up and concentrated on the tide-line. 

The pumice formed as lava erupted under water and air trapped in tiny pockets in the rock makes the it buoyant. This was the largest such eruption in the region for over fifty years. There were all sorts of plant and animal life attached to some of the larger and rougher pieces, and I wonder what land-based life will find a niche in the new rocky tide-line. 

The pumice is light and floats like the bladders of the seaweeds which it lies with on the shore

Most of the pebbles are small, but some are as large or larger than a cricket ball

The pumice floated from north of new Zealand to the south east coast of Australia

A few art lessons from Melbourne

Add your name if this is your work, I don't want the credit, just spread the word
Street art on Hosier Lane 14th February 2014

It has been a hot few weeks in Melbourne and I was down to look around some Tawny Frogmouth sites with Marian Weaving who is studying them there, out in suburbia. Then once I did that I went into town to look up the recent artwork. The collections in the galleries were as good as ever, but there were great environmental messages going on out on the streets, especially in and around Federation Square.

In the middle of the square is a triptych sculpture of Dogman and Rabbitgirl riding a rhino, the creations of artists Gillie and Marc. I am familiar with their work, and it is good to see this plea to help save rhinos in such a high profile.

Rabbitgirl and Dogman ride a rhino for life

Thousands of people pass through the square every week, day? Many took photos of themselves in front of the sculpture, but unfortunately very few took the time to read the message. I know, I watched them. Most were tourists from around the world; what apathy from people who profess to enjoy the planet.

Thanks for the message Gillie and Marc

Impressive art for an impressive animal

Meanwhile over on the pavement across from Flinders Street Station, Chris Jordan had built a sculpture of a mobile phone with old mobile phones about to be re-cycled. He was in town to add his voice and skills to the Sustainable Living Festival, to see more on that click this.

A mobile phone made with mobile phones

Re-cycle your old phones!

Chris was giving a talk in the Deakin Edge theatre on various topics concerning our waste and the damage we cause to other animals on the planet. Part of his presentation included a viewing of his powerful video on the effect plastic is having on albatrosses  This was uploaded on line two years ago now, but the message is still the same. If you haven't seen this and would like to watch it, click here, but be warned it is sad, very sad.

More on aging and sexing Rufous Whistlers

Following some interesting feedback on the previous piece on aging and sexing Rufous Whistlers Pachycephala rufiventris, I have added a few more examples of details to look for when doing so.

Adult female Rufous Whistler
Charcoal Tank, NSW, Oct 2010

This first adult female (3+) shows the features of a dark red eye, dark black bill, white throat streaked with dark grey and streaked breast.

Left - Adult female, right Immature (unsexed)
Charcoal tank, NSW, Oct 2010

The shot above shows a second adult female (3+) alongside an immature, unsexed bird (2). Her eye is clearly red compared with the young bird's brown eyes. Her head is grey streaked with black, her belly is pale buff, almost white, and she has very little streaking on her undertail coverts. In comparison, the young bird has a grey/buff head with finer black streaks, its belly is a creamy orange and there is definite streaking on the undertail coverts. The immature bird would have hatched in the Spring two years previous to that when the shot was taken, but as it was still early in the breeding season when the bird was caught, October, and as sub-adult males can breed in their second year while in such a plumage, the bird cannot be sexed. It might yet moult into sub-adult male plumage later in or after the breeding period.

The photograph below shows the heads in profile of the same two birds. Note the female's grey head versus the young bird's brownish colour. Her iris is red, the other bird's is brown. Her bill is black on the outside upper and lower mandibles, and inside. The young bird's bill is dark, almost black on the upper mandible, brownish grey on the lower, and with a pale yellow inside the roof. Also her bill is worn with use, with chips and flecks taken out of it, while the young bird's bill is smooth edged and clean-looking with pale margins.

Left - Adult female, right Immature (unsexed)
Charcoal Tank, Oct 2010

In comparison of the two adult birds, the second adult female has a brighter shade of red in her eye, her breast is less rufous, her belly is paler, and her undertail coverts are less streaked. This might simply be normal variation in colouring between individual birds. However, she might be an older bird, so further study needs to be done on the features listed here on re trapped birds of known age, to help clarify this point.

How to age and sex Rufous Whistlers

Two Rufous Whistlers - but what age and sex are they?
Charcoal Tank, NSW. March 2010

I have recently been in correspondence discussing how to age and sex Rufous Whistlers Pachycephala rufiventris, so considering that they are one of the most widespread bird species in Australia, I thought I should post a simple guide to this dilemma. 

The problem arises from their plumage moult sequence over the first years of their life. For they take three years to attain full adult plumage, and during the first two years, the males and females are alike (to our eyes and criteria so far discerned). Do the birds know which sex each other is, I'm sure they do, so why can't we tell?

This is not a complete description, indeed there might be errors. However, during future banding trips, I hope to photograph birds of known age (from previously banded birds) and note details which will help to further understand how to age and sex these common birds. The page will then be updated as fits new points to consider.  

Juvenile Rufous Whistler
Charcoal Tank, NSW. January 2011

Juvenile (J) Rufous Whistlers are recognisable by their bright yellow gape, the skin at the base of their bill, light-coloured bill and heavily streaked breast. These are usually being closely attended by adult birds.

Eye - dark brown iris

Bill - pale grey upper mandible, pink/yellow/grey lower  

         mandible, orange yellow inside

Breast - buff and heavily streaked

Throat - grey streaked with dark grey

First-year or Immature  Rufous Whistler
Charcoal tank, NSW. Sept 2012

First-year (1 or 2-) birds, or immature, those in the first year of their life have a similar plumage to the juveniles and adult females. Also the sexes are indistinguishable. The orange/yellow inside of the bill is the most diagnostic feature when in the hand, but not so useful in the field. Then, the pale lower mandible below the darker, but not dark black bill is the best feature to look for.

Eye - brown

Bill - dark grey on top mandible, pink/brown lower mandible.

Breast - pale buff streaked with dark grey.

Throat - grey streaked with dark grey/black.

Adult female Rufous Whistler (3+)
Charcoal tank, NSW. Nov. 2012

Adult female (3 or 3+) birds can be recognised by their black bill, dark red iris and lightly streaked breast. Their throat is white rather than grey as in a first-year bird. However, second-year males (2), i.e. those more than one year since hatching, look very similar. Banded birds can be aged with reference to when previously caught, otherwise behaviour is perhaps the only clue to sex in the field. In spring and summer try to determine whether the bird is behaving like a male or female. And beware of this piece of confusing knowledge - male Rufous Whistlers (and females?) can breed in their second year while in sub-adult plumage or in that similar to females.

Eye - dark deep red

Bill - black top, lower, and inside, pale palate

Breast - light rufous streaked with dark grey

Throat - white, streaked with dark grey

Sub-adult male Rufous Whistler
Charcoal tank, NSW. Sept 2012

Second-year, or sub-adult male (2) i.e. those more than two years since hatching, but less than three. These birds show the beginnings of adult male plumage coming through the immature plumage which was similar to that of a female. A dark grey or black breast band spreads across the top of the breast, and black feathers come in around the face. The throat whitens and loses its streaks. And the iris is red, but not as bright as that in an adult male's eye.

Eye - dull red

Bill - black on top, lower and inside, pale palate

Breast - rich rufous, with narrow dark streaks, faint or

             incomplete breast band

Throat - white and lightly streaked, dark feathers

              around face

Adult male Rufous whistler
Charcoal tank, NSW. Sept 2012 

Adult male (3 or 3+) Rufous Whistlers are the easiest to identify, not only to species but to sex. They have a distinctive rufous breast, belly and undertail coverts, a bright white throat and a black breast-band with linked black feathering up the sides of the throat and across the face. The eye is bright red and the bill glossy black.

Eye - rich red iris

Bill - black top, lower and inside

Breast - rich rufous with a black breast-band

Throat - pure white

New Travel Blog

The Lion of St Mark and St Theodore atop columns  in Venice

I have opened a separate blog for my travel photography portfolio as it is too large and diverse to fit neatly into this, my main blog on wildlife and wildplaces. There are some places I visit which are not particularly wild after all. Although I do still tend to see the wild side of things wherever I am. Some of the travel shots I take might be standard in style, but most are from my own personal viewpoint. I like to look for details in colour and form, and powerful compositions.

The first set is on Venice - which is just so photogenic - and I had fun exploring the canals and alleys  for something different in what must be one of the most photographed cities in the world.

So, if you would like to see my travel portfolio please click here.

'Dali' church

Brown Treecreepers: 
How to tell their age and sex

I am building up a portfolio of photographs which show how to age and sex various species of Australian birds. These will be posted in a separate blog, but for now I will upload them to this site and would be grateful for any comments prior to collating them on the new site. The birds have all been caught in mist-nets during long-term field studies, mostly run and organised by Mark Clayton or Richard Allen, to whom I am grateful for their knowledge in confirming the birds' plumage patterns, particularly some of the more tricky species.

As a sample of how I intend to progress with the project, here are a few images to aid people in aging and sexing Brown Treecreepers Climacteris picumnus, following differences in their plumages.

 

Adult (1+) male Brown Treecreeper
04/11/2012, West Wyalong, NSW.

The bird on the left is an adult male, categorised  as 1+, a bird of one or more years old. It is recognisable as an adult by the bold eyestripe and breast markings. The sex is determined by the black freckle spots arranged in a necklace around its throat. The throat's rich buff-orangy colouring is also indicative of age, although more comparative and less useful as a guide if only one bird is seen at a time.

The dark dashes on the breast feathers are the brown edges to the breast feathers which have a wider band of white/buff down the shaft than in those of birds in their first year. Therefore the dashes on the adult birds are farther apart.

First-year (1, juvenile) male Brown Treecreeper
15/12/2013, West Wyalong, NSW.

The bird on the right is a first-year male,
categorised as a 1 juvenile, as it still has folds of skin around the base of its bill, the remains of its juvenile gape.

Again, it has a black necklace of spots. Females, adult and juveniles/first-year birds, have rusty-red spots on their necklace.

First-year birds of both sexes have narrower dark-fleck patterns on their breast feathers. This being due to narrower bands of white along the feather shafts than on adult birds.

The same adult male

When the adult's head is seen from the side, there is a distinct contrast between the prominent eyestripe and buff supercilium, highlighted by a faint white top edge. These markings on the first-year bird are less obvious, as is the contrast between the grey tail tips and the rest of the tail, which in the adult is strong due to the darker upper tail colour. There is a similar difference between the dark primaries and primary coverts of the adult and the grey/brown colour of those of the first-year bird. 

When seen close in the hand, the tips of the adult bird's greater coverts are faded and frayed, while those of the first-year bird are fresh with buff tips. This last point is also a useful diagnostic feature for aging birds of many other species and will be repeated when applicable in further aging and sexing of birds notes as I compile them.

The same  first-year, juvenile.

Yet another Golden Eagle found poisoned on a Scottish grouse moor

A satellite-tagged Golden Eagle lies dead, poisoned on a grouse moor (RSPB Investigations)

Despite assurances from the authorities that the killing of Golden Eagles and other raptors in Scotland is being dealt with, yet another eagle has been found poisoned on an estate managed for grouse shooting. And once again it is in the Angus hills where many other birds have been found killed in recent years.

This bird was satellite-tagged while a fledgling in 2011 in Perthshire, from where it moved to Badenoch and lived freely. However it fatally moved to Angus and died from ingesting poison, probably by eating laced bait deliberately laid out to kill raptors. Roy Dennis of Highland Foundation for Wildlife, who was tracking the bird became aware that the bird had not moved for several days, so alerted the RSPB, whose investigation officers and police found the bird dead at the spot marked by the satellite tag's coordinates. Subsequent analysis showed that the bird had died of poisoning by carbofuran. The bird's movements throughout its short life can be viewed by clicking the link below to the HF for W website.

http://www.roydennis.org/category/golden-eagle/fearnan/

Will this killing ever be stopped? (RSPB Investigations)

The movement of this bird clearly shows how if such a bird is killed on any estate it is not only the local birds which are killed but those from the national population. As the birds are killed, they leave a gap in the habitat, an empty territory which attracts other birds. These are subsequently killed too and so on. How many of the Scottish Population of Golden Eagles are killed per annum. In the Angus hills alone, in the past five years there have been four other Golden Eagles killed by shooting, poison or trapping, as well as seven Common Buzzards and a Red Kite. And a White-tailed Sea-eagle nest tree was felled. These are only the incidents which have been found and reported, how many more go undetected. Regardless of emotions, this behaviour is illegal and should be dealt with. This is a sad refection on the care Scotland shows for what is regarded by the people as its national bird, surely this time, is THE TIME for the government to be seen to rectify this abuse of our widlife.

I ask all my international as well as Scottish readers to write to the Scottish Minister for Environment and let him know how the lack of prosecutions and effective legislation for the protection of raptors in Scotland looks in the world's eyes. His address is Mr Paul Wheelhouse, Minister for Environment and Climate Change. ministerforenvironment@scotland.gsi.gov.uk

And please forward this page to anyone you know you may be interested.

Thank you.

Fearnan, the eagle which was killed as he was when a nestling (Keith Brockie)

Probable protective nesting association between Australasian Figbird, Noisy 
Friarbird and Papuan Frogmouth 

A Papuan Frogmouth sits on its nest set between that of  a pair of Australasian Figbirds with begging chicks on the left, and a partially constructed nest of a Noisy Friarbird up to the right.

I have an article on frogmouth nesting behaviour in the recent edition of  Australian Field Ornithology
(Vol 30: pp126-130).

While on a field trip to Cape York in 2011, I found a Papuan Frogmouth Podargus papuensis sitting on its nest about 15m up a Leichhardt Pine Neolamarckia cadamba by a roadside on the edge of rainforest. The nest was well concealed among epiphytic ferns on one of the lower limbs, and although there have not been many nests of this species described, from experience with the closely related Tawny Frogmouth, I would expect this to be a normal type of nest site.

However, this nest site was intriguing for another reason. The nest was set within one metre of and between those of a pair Australasian Figbirds Sphecotheres vieilloti and a pair of Noisy Friarbirds Philemon corniculatus. It seems that these two other species had deliberately selected to nest close to the frogmouth nest, probably for protection (the frogmouths had well-grown chicks and would have nested first). The much larger frogmouth would be more likely to ward off any potential predators than the passerines themselves. If this was the case, this would be the first recorded example of a frogmouth or any of the caprimulgiformes behaving as the protective species in a nesting association.

The arrow points to the trio of nests set on
and around the angle of the branch