Monday 28 March 2016

The Migrant Birds of Chuping Grassland Feb'16 - PART 2

There are many things in the universe which science has yet to find an answer - like why some people do not like to put on the indicator light when changing lanes? or why it appears that Singapore has more rare birds visiting them frequently? or perhaps why all planets are round and not square or triangle in shape? When science can't find an answer to a phenomenon then the spiritual perspective will usually fill the void. 

Unlike some migrants birds which may have took off as early as February, some of them have preferred to stay a little bit longer - either due to the reason that they have arrived later during the autumn migration or perhaps they are filling their fats and strengthening their flight muscle before embarking their arduous journey home. Here are some of the migrant birds which are still around in mid February:

Common Kestrel (Falco tinnunculus) - female
What a beauty ! Basking herself in the glory of the early morning sun rays. 


Eastern Marsh Harrier (male)
This is what happens when you have forgotten to change the aperture in your camera otherwise it would have been a splendid photo.

The same bird as it flew further away.


Pied Harrier (female)
She is scheming the weeds below for her first morning meal.


Common Stonechat / Siberian Stonechat (male)
Presently there are 24 known subspecies of stonechats (HBW alive). Most of them i believe were based on geographical variation. Out of the 24 subspecies, only two are said to occur in Peninsular Malaysia i.e Saxicola stejnegeri and S. przewalskii. No worries as long as you call them either a Common Stonechat or a Siberian Stonechat nobody will laugh at you.

Did you just said i am from Siberia?

Here is another male common stonechat which was seen not too far from the first one. This one appears like having some new and fresh feathers sprouting out near its rump.


How do you differentiate between a male Oriental Pipit and a female Oriental Pipit? Well just look at their legs. This one i think is most likely a female.

This one appears to have a longer snout and beak but since i have not mastered the features of a Richard's Pipit, i will just named it as an Oriental Pipit as well.


Brown Shrike
This shrike has also yet to depart for home.


Here are some of the resident birds which are equally stunning.
Purple Heron
It stayed motionless like this for close to 10 minutes but eventually it still missed catching the prey.


Little Grebe
They are a pair i believe.


Female Pink-Necked Green Pigeon

Its not easy to  photograph them in flight. This one was just one lucky shot.


Here is one which i have not seen before - a leucistic Yellow-Vented Bulbul !



Despite its condition, it still retains its yellow vent. There have been  a few reported cases of leucistic Yellow Vented Bulbul in this region and i believe Wong Tsu Shi has also photographed one in Sabah. Why is this bulbul species are so prone to deficiency of melanin ? You might just need to ask the bird scientist.


HAPPY BIRDING !



Friday 18 March 2016

The Migrant Birds of Chuping Grassland - Feb'16 - PART 1

Spring is in the air and it marked the start of an epic avian migration ever witnessed in this part of the hemisphere. By the time you read this post, the raptors of Pulau Rupat have already started their journey en-masse just like some of the wildebeest of Tanzania albeit in a slightly smaller scale. What triggers them (the birds) to start this epic journey? Do they follow the same route back to their breeding grounds? Are they all migrating at the same time? These are some of the intriguing questions which are often posed to the scientific community. 

As a self-trained birdwatcher, i have always tried to find an answer to those questions. Perhaps i could find some of them in this vast grassland.

Oriental Honey Buzzard (OHB)
From its features (greyish head and dark brown eyes), this OHB is certainly an adult male orientalis. (common morph). There were two of them and they were flying just above the tree tops and heading towards east. Question: could they have been heading for 'home' or are they just some resident OHBs? To answer those questions, there are two information leads which you could look for. Firstly the migratory form of orientalis are reported to be generally paler while the resident bird has darker underside. Secondly migratory raptors usually fly higher. However i could be wrong as some migratory raptors are known to "overnight" in their staging areas while waiting for the right time to continue their journey.


Unlike the above OHB, this forked-tailed swift (Apus pacificus) was heading north (towards Thailand) instead of eastwards. 
Apus pacificus
There were 5 of them but this one flew closes to me. Some reports have indicated that A.cooki is more common in open areas and in northern Peninsular Malaysia but i have identified the above swift as an A. pacificus based on its broader white rump band.

The same bird with a visibly large white band on its rump. Looks a bit like a tomahawk cruise missile.


Just like the above fork-tailed swift, these Oriental Pratincole (Glareola maldivarum) were also heading northwards.
Oriental Pratincole
Although there have been breeding cases reported in Selangor, Kelantan and Kuantan in the past (Allen J & Pearson 2012), it will be quite difficult to determine whether these birds are actually resident birds or migrants. Perhaps a satellite transmitter can be placed on one of them to track their movements. If they were indeed migrant birds then they could have flown from as far as Indonesia and Australia.

I saw a total of 15 birds in a span of 10 - 15 minutes. They did not appear all at once but mostly in a single file, sometimes two and at the most 3.

I believe its much easier to differentiate "pratincole" while they are in flight rather than when they are aground. The absence of the white trailing edge to the wing should eliminate them from a "Collared Pratincole" (Glareola pratincola). 

Note: they were once included in the "wader" category but now they are more or less a distinct species.

Most of them are already in their breeding colors - red-bill base.


From this anecdotal observation you can see that the above three species of birds (if they are indeed migrants) have chosen different routes in their spring migration. Does that also meant that some of them uses the land route while some would prefer the sea route?

More answers can perhaps emerged from the next few posts.


to be continued in Part 2......

Wednesday 2 March 2016

Identification of Swiftlets and Swallows (PART 2)

Unlike the earlier swiftlets (Germani and Fuciphaga), majority of swallows are more conspicuous in their plumage. Barn Swallow was one of them. 

A photo of a juvenile Barn Swallow with all the typical features associated with it - pale face and pale chest area, whitish underparts and shorter tail streamers (partly hidden)

This could be a sub-adult female

Another juvenile

You can see the little white patch at the base of its streamers.

Although the above photos were mainly juveniles, you should somehow able to differentiate them out from other swallows. However things may get a bit complicated if you wish to go a bit deeper into identifying its subspecies. Here is what i meant.

This could be the common Hirundo rustica - pinkish underparts/body. Apparently there are six (6) recognised subspecies but at the moment i believe only two subspecies occur in Malaysia.

Could this be the more rarer H. tytleri ? This photo was taken in Chuping, Perlis. 

Here are some recent photos of a Barn Swallow - taken in KL - April 2016
It would be near impossible to take a decent photo of them when they are in a feeding frenzy. Best times would be when they are in a cruising mode.

Check out its additional tail streamers


Just like the above Barn Swallows, it should not be too difficult as well to identify these "Rufous-Bellied Swallow" - subspecies of Badia.


Apparently these species of swallow is considered a "resident" swallow but the intriguing thing is that you will only be able to see them during certain times of the year i.e usually in December to January and usually in the company of other migrant birds such as the Barn Swallow (pers obs).


The features of the following swifts can be a bit tricky in the field. However with some careful observation, you should also be able to differentiate them as well.


The above photos show a single House Swift (Apus Afinis) - identified from its whitish throat and white rump-band - easy right ?

The ones below were taken in KL - March 2016

Unmistakable features


The next swift however would need a bit more of your closer attention.
Not easy wor !


Now i believe you should be able to identify it as a 'Black-nest Swiftlet' (Collocalia maxima / Aerodramus maximus)  - stockier body and lacks tail notch.


This final swift should be quite easy.


Yup ! its a Forked-tailed Swift.

Presently there are four (4) recognised subspecies i.e i) Pacific Swift (Apus pacificus), ii) Salim Ali's Swift (Apus salimali), iii) Blyth's swift (Apus leuconyx) and iv) Cook's Swift (Apus cooki). From the description available in field guides and literature, the above swift should be a Pacific Swift (Apus pacificus) which is noted for its long distance travelling from the far regions of the Northen Palearctic.


I believe every living creature in this world have existed for a reason or perhaps a few reasons. Swift and swallows are here not only for its beauty and splendour but they could have a more important role in eradicating unpleasant and potentially harmful airborne disease carrier insects such as mosquitos.

HAPPY BIRDING !

Sunday 21 February 2016

Identification of Swiftlets and Swallows (PART 1)

Would you be able to filter out which species of swiftlets and swallows from this flock? The answer to this question can range from "quite easy" to "near impossible".  Let me begin with the difficult ones first.

Introduction

Avian literature on some bird species has been limited or otherwise scarce. At times their conclusion can be both confusing and challenging for most bird-watchers as well as the common people. One of the bird species in question should be the study on swiftlets. While the taxonomy of some swifts and swallows are straight forward and indiscreet throughout its range, for example "Whiskered Treeswift" (Hemiprocne comata), Barn Swallow (Hirundo rustica) and House Swift (Apus affinis), however there are some of which are still in the state of flux, particularly the swiftlets.

"The taxonomy study of South-East Asian swiftlets has proved challenging due to their limited variation in size and plumage coloration" { Earl of Cranbrook et al (2013), Forktail 29; 107-119 }

Classification of Swiftlets

In their research titled "Phylogenetic relationships amongst swifts and swiftlets: A multi locus approach", Henri A. Thomassen et al (2005) reported that originally, all swiflets were placed into a single genus, "collocalia" and this classification has been used for many years. However in 1959, echolocation was discovered in swiftlets which led to a revision of swiflets taxonomy. Brooke research in 1970 and 1972 split the genus "collocalia" into three (3) different genera:

i) non-echolocation "collocalia"
ii) non-echolocation "Hydrochous" - i.e Giant Swiflet (now named as "Waterfall swiftlet")
iii) echolocation Aerodramus

The classification based on echlocation however did not gain much support by the scientific community. Later many more research were carried out and the most reliable results todate are the ones on their nest construction and tarsal feathering. This has subsequently led to a general division of swiflets into "white-nest swiftlets" and "black-nest swiftlets". In their research titled "The species of white-nest swiftlets (Apodidae, collocaliini) of Malaysia and the origins of house-farm birds: morphometric and genetic evidence",  Earl of Cranbrook et al (2013) reported that swiflets were described as small swifts "Apodidae", of subfamily "Apodinae" and tribe "Collocaliini".  

Results from the research on their nest construction has further led to the classification of subspecies "germani", "javensis", "vestita" and "micans" as white-nest swiftlets ! Meanwhile in this region, it was reported that the nominated subspecies "Collocalia germani germani" is considered to be conspecific with the edible-nest swiflet (Wikipedia) ! Allen J & Pearson (2012) field guide however has treated both "C. germani" and "edible-nest swiftlets" as a single species of "Aerodramus fuciphagus". Robson's field guide and Handbook of the Birds of the World (HBW) meanwhile described "C.germani" as a resident swiftlet while "edible-nest swiftlet" occurs from Java to lesser sundas. 

Note: there are also research which have reported that "long distance movements of swiftlets cannot be discounted as they can overlapped in their diurnal activity range"

General Comparison of Germani and Edible-Nest Swiflets

So, you might asked what's in for bird-watchers then ? Moving aside from the mumbo-jumbo of science and for the fun of bird watching, here is a more simplistic description of both the swiftlets (i.e in terms of their external features).  

According to HBW, "germani" is described as having "strikingly pale underparts and broad whitish rump" while Earl of Cranbrook et al (2013)  has divided "germani" into "Northern Grey-rumped Swiftlets"  which is reported to occur in Northern Peninsular Malaysia and the "Southern Brown-rumped Swiftlets" which is reported to occur further south and in Sabah ! Aside from the above description and based on my personal field exposure, generally you will be able to observe some noticeable differences. 

Let see whether we can differentiate the species from the photos below:

Plate 1.1


Plate 1.2


Plate 1.3


Plate 1.4


Plate 1.5

The one below was taken in KL - Mar 2016
Note: its rump color is more brownish/less whitish.

---------------------------------------------------------------------------------------------------------------------
Plate 2.1


Plate 2.2


Plate 2.3


Plate 2.4


Plate 2.5

The ones below were taken in KL - Mar 2016

Nice wing profile

Summary

From the above photos,  you will noticed that there are considerable amount of variations in their wing shape, body size and colors. Here is the summary of the structural differences:

Plate 1.1 to 1.5                                               Plate 2.1 to 2.5
* longer wings and more pointed                   * shorter wings
* looks plummer                                               * smaller size
* uniformly darker                                            * body color paler

Other observable information (which can only be seen from the field):

* fluttering flight, gliding intermittently            * flight more rapid 
* more abundant                                             * lesser in numbers

Note: Unless otherwise indicated, all the above photos were taken at three Northern states in Peninsular Malaysia i.e i) Penang (A.I.D), Kedah (near Sg Petani paddy fields) and iii) Perlis (at Chuping) from the months of December 2015 to February 2016 and between 8.30am to 12.30pm. 


Also take note of the notch tail in the first 2 photos (plate 1.1 and 1.2). For general identification purposes and for the fun of bird watching, it can be said that the birds shown from Plate 1.1 to Plate 1.5 could probably be from the subspecies "Germani" while those depicted from Plate 2.1 to 2.5 could point to those of "edible-nest swiftlets". While we wait for more conclusive results from the scientific community especially from the advent increase of using nuclear and mitochondrial as markers (also to determine the existence of hybridisation), let us enjoy the swiftlets as it is for now. Also note that generally swiftlets fly higher than swallows. So whenever you have noticed some birds flying nearby a thermaling raptor kettle high up in the sky then they are mostly likely be swiftlets.

......to be continued in Part 2.

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