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Pin-tailed Parrotfinch – Yellow Morph

on 10th December 2021

I was fortunate to come across another yellow colour form or yellow morph of the Pin-tailed Parrotfinch (Erythrura prasina prasina) (above, below). The last time I saw one of these was on 2nd August 2017 when I observed a single adult male.

Today I saw 5 birds feeding together on bamboo seeds. Two were typical adult males (one shown below, 2 typical females and 1 yellow morph female. Unlike the male yellow morph that has yellow on the beast and rump, the female ‘version’ has yellow only on the rump with a shorter tail.

One of the other females was also a little odd in plumage with some yellow and blue on the wings/back (see below) – I suspect this is a moult.

Wells (2007) states that the yellow form occurs in a “minority”. Payne (2017) in Handbook of the Birds of the World Alive says it is “rare”. The Finch Information Centre states that is an “autosomal recessive mutation which occurs naturally in 5-8% of the wild populations”. See: http://www.finchinfo.com/birds/finches/species/pin_tailed_parrot_finch.php

Tulk, writing for the Australian Finch Society on Gouldian Finchs and colour variants, contributes to the issue: “It is amongst the small number of bird species in which this phenomenon exists (multi-morph). There are many examples of species that have established two colour phases. …. The Crimson Finch and the Pintailed Parrot-finch can be used as an example. Both species have red and yellow colour forms or morphs established in the wild. These naturally occurring colour variants show part of the continuing evolutionary process of these species. Colour variants are a naturally occurring phenomenon and can only exist in numbers if they are well established. In the wild, this is difficult, as natural selection is far more random …” See: http://www.australianfinchsociety.co.uk/article2.htm

Gerhard and Wörz, when discussing the Pin-tailed Parrotfinch, especially from a breeding perspective, offers this information “This colour morph does not constitute another subspecies but is a mutation which influences the synthesis of Carotinoides. These birds no longer produce the cantthaxantin responsible for the red color. The mutation can be found in males and females. The only difference between red- and yellow-bellied females is the colour of the rump which is yellow with the mutants. Currently ‘yellows’ are rarer than the red ones and as this mutation is inheriting recessive …

 

Amar-Singh HSS (Dato’ Dr)

Ipoh, Perak, Malaysia

 

Location: Kledang-Sayong Forest Reserve, Ipoh, Perak, Malaysia

Habitat: Broken-trail along primary jungle

Date: 14th November 2018

Equipment: Nikon D500 SLR with Tamron SP 150-600mm f/5-6.3 Di VC USD, handheld

 

 

If you like this post please tap on the Like button at the left bottom of page. Any views and opinions expressed in this article are solely those of the authors/contributors, and are not endorsed by the Lee Kong Chian Natural History Museum (LKCNHM, NUS) or its affiliated institutions. Readers are encouraged to use their discretion before making any decisions or judgements based on the information presented.

YC Wee

Dr Wee played a significant role as a green advocate in Singapore through his extensive involvement in various organizations and committees: as Secretary and Chairman for the Malayan Nature Society (Singapore Branch), and with the Nature Society (Singapore) as founding President (1978-1995). He has also served in the Nature Reserve Board (1987-1989), Nature Reserves Committee (1990-1996), National Council on the Environment/Singapore Environment Council (1992-1996), Work-Group on Nature Conservation (1992) and Inter-Varsity Council on the Environment (1995-1997). He is Patron of the Singapore Gardening Society and was appointed Honorary Museum Associate of the Lee Kong Chian Natural History Museum (LKCNHM) in 2012. In 2005, Dr Wee started the Bird Ecology Study Group. With more than 6,000 entries, the website has become a valuable resource consulted by students, birdwatchers and researchers locally and internationally. The views and opinions expressed in this article are his own, and do not represent those of LKCNHM, the National University of Singapore or its affiliated institutions.

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