Bird List Revision for July 2021

The latest revision of the Singapore Bird List is now derived from IOC World Bird List Version 11.2. The downloadable list (in Excel format) is available HERE.

The following are the major changes:

Addition: Wedge-tailed Shearwater – First record of a single bird at Woodlands on 22 June 1998, second record of a single bird at Bishan Ang Mo Kio Park on 23 June 2021.
Addition: Malayan Black Magpie – First record of a single bird at Hindhede Nature Park on 9 June 2021.
Addition: Siberian House Martin – First record of a single bird at Neo Tiew Harvest Lane on 3 January 2021.

Along with the checklist update we are happy to introduce new members to the Singapore Birds Project team. Dillen, Keita, Movin and Sandra will be contributing ideas through articles and the checklist management. We take pride in ensuring that the checklist is regularly, accurately and transparently updated. Please feel free to drop any of us a message if you have any queries or suggestions!

Photo: Siberian House Martin, by Mike Hooper

Measurements of the 23 June 2021 Wedge-tailed Shearwater in Bishan

Pelagic birds are rather scarce in Singapore, so news of the grounded Shearwater found at Bishan-Ang Mo Kio Park on 23 June must have caught everybody by surprise. The bird was originally found by a passer-by below a HDB block in the area and then transported to the park. It was later spotted by William Khaw, who alerted the birdwatching community and ACRES. Many others contacted ACRES as well but despite being rescued, the bird did not survive. I was fortunate enough to take a look at the bird’s carcass with my colleagues and managed to get some measurements that are reproduced below. While photographs of the bird are aplenty online, I hope that these numbers will help serve as primary documentation for future birders as well as help those still wavering on the identification.

FeatureMeasurements of the Bishan bird (mm)Measurements (mm) of Wedge-tailed Shearwaters (WT) and Short-tailed Shearwaters (ST)
Tail119.0WT: 123-138
ST: 78-85
(Pettit et al., 1984; Longmore, 1985; Wells, 1999).
Bill depth at base11.3 –
Bill depth at nare (tip of the nostril)10.2 –
Minimum bill depth7.4 –
Bill to skull46.5 –
Bill to feathers39.0WT: 38.47±1.89
ST: 31.82±1.37
(Bull et al., 2005)
Head plus bill81.8 –
Wing279.0WT: 292.99±9.99
ST: 267.11±13.06
(Bull et al., 2005)
Tarsus47.3 –
Mid-toe (including claw)58.5 –
Mid-toe (without claw)50.7 –

The Wedge-tailed Shearwater Ardenna pacifica can be distinguished from the more locally expected (though still rare) Short-tailed Shearwater A. tenuirostris from a number of features. These include the bill shape (comparatively long bill to head ratio) and the tail extension (long in Wedge-tailed Shearwater, shorter in Short-tailed Shearwater). For those who are less familiar, comparison of the measurements against other sources unequivocally confirm the identification as a Wedge-tailed Shearwater; the similar looking Short-tailed Shearwater measures much smaller.

Of the three species of Shearwaters that have been recorded regionally so far, the Short-tailed Shearwater is the most expected around the nation. Although a rare bird locally, it has been reported semi-regularly in recent years along the Singapore Straits during pelagic trips ( Instead, there is only one record of the Wedge-tailed Shearwater so far, yet another grounded bird that was photographed at Woodlands on 22 June 1998 (Wang & Hails, 2007). Coincidentally just 1 day apart, although 23 years ago! The third species, Streaked Shearwater Calonectris leucomelas is expected, though no verifiable records are present as of yet.

If you find any wild animal that needs help, please contact ACRES at 97837782 and/or the NParks hotline at 18004761600.


Massive thanks to the staffs at ACRES, especially Kalai and Ava, who helped keep and pass the carcass to the NUS Avian Evolution Lab, to all who assisted in the rescue process, and to William Khaw for sharing the sighting with the community. I would also like to express my gratitude to Art Toh, Dillen Ng, Martin Kennewell, Movin Nyanasengeran and Tan Hui Zhen for the help in preparing this short piece.

Literature cited

Bull, L. S., Bell, B. D., & Pledger, S. (2005). Patterns of size variation in the shearwater genus Puffinus. Marine Ornithology, 33, 27-39. Link:

Longmore, N. W. (1985). Two new records of the short-tailed shearwater from north Queensland. Sunbird: The Journal of the Queensland Ornithological Society, 15(4), 84. Link:

Pettit, T. N., Byrd, G. V., Whittow, G. C., & Seki, M. P. (1984). Growth of the Wedge-tailed Shearwater in the Hawaiian Islands. The Auk, 101(1), 103-109. Link:

Wang, L. K., & Hails, C. J. (2007). An annotated checklist of the birds of Singapore. Raffles Bulletin of Zoology, 15, 1-179. Link:

Wells, D. R. (1999). The birds of the Thai-Malay peninsula (Vol. 1). London: Academic Press.

What bird is this, and why?


When posting a photo on social media to ask for ID help

    1. Crop and brighten/darken the photos sufficiently so that the bird can be properly seen
    2. Edit the colours accurately to reflect what you saw in the field
    3. Post multiple angles so that different features of the bird can be seen
    4. Provide information about where and when the photo was taken
    5. Make a guess!

When helping someone with ID

    1. Instead of just saying a species name, elaborate on why you identified it as such – provide key distinguishing features or comparisons with (or to rule out) similar looking birds.

There are more than 10,000 species of birds worldwide, and of which more than 400 can potentially be found within the political boundaries of Singapore. Some species look more or less the same throughout the year, while others can look very different depending on their sex, age and whether or not they are in their breeding plumage. With so many possible combinations of shapes and colours, it can be a seemingly daunting process, especially for new birders, to learn how to identify the feathered animals in the field. The rapid increase in photography and social media usage among the local birding community has made this learning process much easier, and this post aims to improve everyone’s birding journey by providing some tips on how to ask for and help with species identification. These tips are applicable both on social media and in the field, as well as beyond Singapore.

Asking for help with identification

Editing photographs for identification purposes

Everyone has their own style and preferences when pursuing the art of photography. However, when it comes to using photos to identify birds, you should edit your photos to show as much of the key features of the bird as possible, as accurately as possible. Leave your artistic license behind for after the bird is identified!

    1. Crop the photos to show the key features

Social media platforms like Facebook and Whatsapp tend to reduce the quality of the uploaded images, which makes zooming into a photo a difficult and sometimes futile process when attempting to identify a small bird in a big picture. Crop your images sufficiently so that the key features of the birds can be seen.

White-throated Needletail_31-10-17_Singapore_SMALL
Dot-in-the-sky Bird?

    1. Brighten the photos sufficiently

Pictures taken in backlit conditions often suffer from underexposure such that the features of the birds cannot be seen properly. In such cases, try to increase the exposure and shadows to (attempt to) salvage the images. If available, edit from RAW files for better results.

White-throated Needletail_31-10-17_Singapore_DARK
Looks like a Needletail, but still can’t tell what it is…

White-throated Needletail_31-10-17_Singapore
Ah, this is a White-throated Needletail! (Henderson Waves, 31 October 2017)

    1. Keep the colours accurate

Some species are much easier to identify in the field than in pictures because of the subtle colour differences in their plumages. Try your best to edit your photos so that they reflect the information your eyes captured in real life. Having a properly calibrated monitor helps with this.

Brown-Streaked Flycatcher 2_15-08-17_Singapore_GREY
What happened to the picture? What colour is this?

Brown-Streaked Flycatcher 2_15-08-17_Singapore_CORRECTED
The colours seem much warmer than the Asian Brown Flycatcher. Looks like a potential Brown-streaked! But I’d like to look at the upperparts to be 100% sure…

    1. Provide several angles if possible

The key identification features of some birds might not always be visible in a single photo, so having multiple photos from different angles would be helpful. Sometimes, seemingly trivial features such as the rump and primary projection (the length of the birds’ wings when folded) can be important characteristics as well.

Brown-Streaked Flycatcher_15-08-17_Singapore
Same bird as before. Brownish fringes to the wings and coverts rules out the Asian Brown Flycatcher – this is a Brown-streaked!

Where and when did you see it?

The local birding community has seen a lot of drama and politics unfold regarding who told who, who did not tell who, why did you not tell me immediately, and so on. THIS SECTION IS NOT REFERRING TO THAT!!

When identifying a bird, it makes most sense to start from the most probable candidate and slowly eliminate the possible options before considering the rarest case (and not the other way round). The location and month that a bird was photographed can make a big difference in this mental process, and in some cases, providing such information can reveal some important ornithological records.

Let’s say I post this photograph on a birding group focusing on Singapore’s birds to ask for the identification, with no information at all except “ID pls”

Grey-cheeked Green Pigeon_02-08-19_Indonesia_Bali
ID pls

Most people would probably identify it as a Thick-billed Green Pigeon, which is wrong! The photograph was actually taken in August 2019 in Bali, Indonesia, where there are no wild Thick-billed Green Pigeons. This bird is in fact a Grey-cheeked Green Pigeon (distinguished from Thick-billed by, among other features, the bluish bill base instead of red). There have been cases of people asking for identification with no information – not even country – which can make it very difficult to narrow down the possible species.

Now let’s consider this Pitta instead.

Blue-winged Pitta_19-07-20_Singapore
Blue-winged or Mangrove Pitta?

This photograph was taken In Pulau Ubin in the month of July, which is outside of the migration season, so the most likely candidate is the Mangrove Pitta. But wait, something is odd…the bill seems small and more importantly the chin is black instead of white. This is actually a Blue-winged Pitta! The fact that this bird was seen in July suggests that they might be breeding on Pulau Ubin again and that helps improve our understanding on the breeding ecology of these birds.

Make a guess!

“ID pls” is a super convenient phrase that takes less than a second to type, but you can do much better than that! There are many field guides and online platforms (*cough* where you can try to identify the birds first. It’s perfectly alright to be wrong, but you will be able to learn more if you post your picture with a guess, and if possible, with reasons why you think so.

Helping with identification

Don’t just give a name, provide reasons when giving IDs!

When I just started birding, I was unable to tell the difference between Asian Glossy Starlings and Greater Racket-tailed Drongos. Both birds have red eyes and glossy bluish-green plumage. To make things even more confusing, some Greater Racket-tailed Drongos lack the long tail streamers. I stared at many pictures online but was still unable to tell the birds apart.

I did not have social media back then, but suppose I posted this image on Facebook.

Asian Glossy Starling_29-01-14_Singapore
One of my first few photographs as a birder. Greater Racket-tailed Drongo or Asian Glossy Starling?

Even if everyone who bothered to help out a newbie replied “obviously an Asian Glossy Starling lol”, I would still have felt uneasy accepting the identification because a much bigger aspect of my question – why? – would still have been left unanswered.

When giving ID help, try to provide reasons for why you think the bird is species A instead of species B. Again, it’s perfectly alright to be wrong! Our brains are so accustomed to identifying the birds instantaneously that it sometimes becomes difficult to pin-point the exact reasons why we think the way we do. Finding out a little bit more about the field marks of the birds, both when perched and in flight, can help improve description skills and make you a better birder.


I was heavily inspired by this article by Tony Leukering in writing this short piece and am also extremely grateful to Elize Ng, Dillen Ng and Goh Cheng Teng for helping to improve the work.

Happy birding!