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May 2012 Volume 24 Number 2 Psitta M AGAZ I NE OF THE W ORLD P ARROT T RUST PsittaScene I N TH I S I SSUE www.psittasc ene.org Eclectus colour mysteries Captive parrot longevity May 2012 Volume 24 Number 2 Psitta Scene fromthedirector World Parrot Trust Glanmor House, Hayle, rogress in parrot conservation comes in many forms, and I’m Cornwall, TR27 4HB, UK. happy to share three recent examples. www.parrots.org In response to input from many conservationists and field Pbiologists – including many from the World Parrot Trust - three parrot species have been added to the Red List of Globally Threatened birds: two contents grey and one green. 2 From the Director As you’ll read in this and many recent PsittaScene issues, African Grey Jamie Gilardi parrots remain under great pressure from trade. These birds once ranged 3 True Colours from the Atlantic coast of Guinea Bissau through over 5,000 kilometers Eclectus Parrot colour mysteries of equatorial Africa to central Kenya. Now, the Timneh Grey Parrot is extinct in the vast majority of its former range, and while the Congo Grey 8 Aiding African Greys Parrot is faring better, it too is extinct from much or all of Kenya, Tanzania, Congo and Cameroon Rwanda, and Uganda. It’s high time these two received due attention from 12 Long Live the Parrot conservationists, so we were delighted when both species were elevated to Longevity in captive parrots Vulnerable by the IUCN (International Union for Conservation of Nature). 16 Parrot Lover’s Cruise 2011 In Central America, another parrot in high demand – the Yellow-naped 18 PsittaNews Amazon – has suffered similarly dramatic declines. In the last two years, Parrot Events and News I’ve driven nearly all of the Pacific coasts of Guatemala, El Salvador, 19 WPT Contacts Honduras, and Nicaragua – all former “nape” strongholds. With a few notable exceptions, these birds are simply gone. Like the greys, saving the 20 Parrots in the Wild Yellow-napes will be challenging, but it helps to start with the recognition Double-eyed Fig Parrot that there is a serious problem, so adding this species to the Red List is indeed a big step forward. The serious work lies ahead of course, but for now, we’re happy to share this bit of good news for these three tremendous talkers. Jamie Gilardi WPT Director Editor: Joanna Eckles [email protected] onourcovers Production: Karen Whitley FRONT A female Eclectus Parrot (Eclectus roratus) shines at the entrance of her The World Parrot Trust does not necessarily endorse any views or statements made by nest hollow. Quality cavities are difficult to find and fiercely defended. The Eclectus contributors to PsittaScene. is notorious for its reverse colour dimorphism. This, as well as many of their unique It will of course consider articles or letters from any contributors on their merits. behaviours, is directly related to the scarcity of quality hollows. © Steve Murphy Go to parrots.org/publications for Guidelines. Anyone wishing to reprint PsittaScene articles in full BACK From the photographer: Fig Parrots are the only Australian bird to excavate or in part needs permission from the author/ their own tree hollow entirely from scratch which probably explains why they heartily photographer and must state that it was copied from PsittaScene. defend their nest when conspecifics come too close. This Fig Parrot is a female of All contents © World Parrot Trust the subspecies Cyclopsitta diophthalma marshalli. She sat motionless at the nest Printed by Brewers - part of the Martin Luck Group Tel: 01326 563424 entrance allowing me to use a long exposure in the dim rainforest light. © Steve Murphy 2 PsittaScene May 2012 True Colours Understanding the ecological and evolutionary forces behind the Eclectus’ unique colouration By Rob Heinsohn © Roland Seitre © Roland As I broke abov lize e the canopy I rea d t hat The birds and th sud everythin e bu denly g tterf ies whizzed past, a wa nd s bel me. the ow coo l breezes in my fa ce limbing above the hot felt divine. and steamy rainforest on Cape York Peninsula, Death to baby boys! at the northern most From the early days of the project I Ctip of the Australian continent was sensed that something sinister was killing an exhilarating experience. It’s a some of the nestlings. Eclectus parrots privileged perspective that not many virtually always lay two viable eggs, yet people will experience but one that on the first climb to the hollow after they were due to hatch there was often I was fortunate to admire on many only one chick in the nest. As it turns occasions over a ten year period. out, the missing chick was almost always I was observing the comings and a male. In a violent act of sex-specific goings of the mysterious Eclectus infanticide, the mothers were tossing Parrot (Eclectus roratus). This many of the males overboard within involved climbing either to access days of hatching. Sometimes we found nest hollows up to 30 metres (98 the pathetic little corpses, with parrot ft) above the ground, or sitting for beak-shaped marks on the back of their long, uncomfortable days on a high heads or necks, either in the hollow, on wooden platform, just watching. the edge, or on the ground below the I was terribly afraid of heights at nest tree. first but after the first season I The adaptive reason behind this had mastered my fear and it was gruesome behaviour soon became clear: replaced by an addiction to the thrill infanticide was only happening in poor of discovering the secrets of these quality nest hollows. These nests are extraordinary birds. prone to flooding during heavy storms, leaving only a short window for those females to nest. It turns out that female chicks typically leave the nest more quickly than males, so it actually pays the mothers in these circumstances to rid themselves of male offspring. This (top) Even Eclectus chicks far younger than these can be differentiated by allows them to speed up the whole sex based on the colour of their down. nesting process and produce at least one Males are light grey; Females dark. chick before the rains come. May 2012 PsittaScene 3 umans are the only other The Eclectus Puzzle Hamilton was essentially puzzled over animals known to kill THE INFANTICIDAL TENDENCIES of Eclectus why Eclectus parrot boys look like girls Hoffspring because of their parrots are just one in a long list of their and the girls look like boys. The two sex. It is probably not even possible bizarre behavioural tendencies, most of sexes are in fact so different, they were for most birds to make the choice which ultimately relate to their colours. long thought to be different species with because male and female nestlings In fact, few birds have puzzled scientists even the best 19th Century naturalists look so similar. Eclectus parrots are more! One of the 20th Century’s great fooled. It was not until about 100 years highly unusual because the chicks grow evolutionary biologists, the late Professor after their discovery that they were finally straight into their adult plumage, and Bill Hamilton of Oxford University, unified under the same name. even before they get feathers the sexes used to show a slide in his lecture series are clearly distinguishable by their down of a male and female Eclectus parrot Eclectus parrots have been very popular colours. Males have light grey down sitting side by side. The male was a as pet birds but there had been no and females have dark grey. It seems vibrant green, and the female a stunning field studies of these birds until our the parents make use of this unusual red. Whereas evolutionary theory had research commenced in 1997. This was ability to distinguish gender to make plenty to say about why one sex in birds understandable as few birds present decisions about which chicks to keep is often more gorgeously coloured, it the field worker with such logistical and which to kill. In theoretical terms, stumbled somewhat in establishing what difficulties. Eclectus parrots live high killing too many males can decrease the had happened in this species. No other in the canopy of rainforests in New value of female chicks because they are bird has sexes so beautified but in such Guinea, west to the Moluccas, east to less likely to find mates later in life. The different ways. Hamilton ended his talk by the Bismarck Archipelago and Solomon balance is delicate and it only pays the saying, “When I understand why one sex Islands, and also on the tip of Cape mothers with really poor nest hollows is red and the other green, then I will be York Peninsula in northern Australia. to commit sex-biased infanticide. ready to die”. Their nest hollows are very high (20-30 m or 65-100 ft) and inaccessible, and the birds are notoriously shy. It was a rash The Eclectus practice sex-based infanticide where male chicks are sometimes tossed moment when I committed myself to from the nest by females with poor quality hollows. This allows them to produce at least solving the Eclectus puzzle. one chick - the more quickly fedging female - before fooding rains swamp the nest. Eclectus parrots probably found their way into northern Australia from their ancestral homeland of New Guinea thousands of years ago when sea levels were lower and the two landmasses were connected. The first nest tree we © Robert Heinsohn © Robert encountered at Iron Range National Part on Cape York Peninsula was the remarkable “Smuggler’s Fig”- a very large specimen of the Green Fig (Ficus albipila).
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