4th May 2011:At sea off Tanjung Dawai, Kedah. Part 2: Jaegers and Brown Booby

The Brown Booby was still around. As last time, it didn't appear till afternoon when the light was difficult, and it didn't come particularly close.







But it provided Peter and James with another Malaysian tick, so they were both happy!



My first view of it on the water.



No Pomarine Jaegers today - perhaps their passage period is over, but Long-tailed were numerous. We estimated about 10 birds.




An adult and a 1st year bird together.



The adult had unusual white markings on the underwing coverts.



Another immature bird on the sea.

Jaegers don't usually come close, but we got lucky today!







A strikingly marked 1st year bird.



The pale blue legs and 'dipped-in-ink' feet are very distinctive.





Towards dusk this beautiful adult started following the boat.



This is one of James's best shots of the same bird. Note the difference between the 100-400mm f5.6 (my pics) and the 300mm f2.8 (James's pics)!

4th May 2011: At sea off Tanjung Dawai, Kedah. Part 1: Shearwaters

James Eaton and Peter Bijlmakers made the trip up from KL for the boat trip today, so I was hoping that they would not be disappointed.



However, things did not look at all promising when we set out. There was a bit of weather about!



The rain and strong winds did not let up for about the first 4 hours of the trip.



Just as the rain was easing, we let out our first net of the day, and voila, Short-tailed Shearwaters started arriving!



And arriving...



...and arriving! Eventually there were 13 birds in this little flock!

They came closer and closer as the net was pulled in till they were practically under the boat, as this clip shows.





































The crew were happy to watch. At least now we didn't have to worry about any of the birds becoming dinner!







After Jeff's email about the possibility of Sooty Shearwater, all were scrutinized closely. Following some helpful correspondence with Jeff and other experts, we were much more clued up about what to look for.



Short-tailed typically has a high, rounded headshape, looks short-billed and has a rather 'cuddly' appearance.





Occasionally we found birds which consistently showed a flatter-crowned headshape and consequently appeared longer-billed. However, compared to Sooty (see this link), these birds are shorter-billed and have noticeably larger eyes (which contributes to their more appealing expression). Sooty looks 'piggy-eyed' by comparison.






In flight, Short-tailed has rather concolourous pale underwings. Sooty typically shows more contrast on the underwing, with dark primaries contrasting with paler wing linings (see this link)





Sooty has narrower, more pointed and less 'paddle-shaped wingtips, and a subtly longer, more wedge-shaped tail (though the feet do often project beyond the tail tip). Also, Sooty is less likely to show a pale chin. Thanks to Jeff Davies, Rohan Clarke and Mike Carter for these tips!



The state of the feathers of these birds puzzled me. Most seemed to have very fresh body plumage, while the wing and tail feathers were more worn, sometimes much more so. According to Onley and Scofield's "Albatrosses, Shearwaters and Petrels of the World", "Timing of moult can be useful in separating Short-tailed from Sooty Shearwater. Adult Sooty Shearwaters moult body plumage from January-March during chick-rearing whilst Short-tailed Shearwaters wait until they reach the Northern Hemisphere in May. Thus birds with moulting, mottled body plumage during January-March are probably Sooty Shearwaters, while those moulting body plumage in May-July are more likely to be Short-tailed Shearwaters." These birds appear to have recently completed a body moult, which I am at a loss to explain, unless these are subadults which may moult earlier than adults.



This bird, with its uniformly fresh flight feathers, must be a juvenile.



Two more birds with an obvious contrast in wear between body and flight feathers.



Some individuals had markedly greyer throats and 'bridles' consisting of a pale eye-ring and line behind the eye (front bird).



This bird had already started its tail moult; the central pair were fresh.



The two birds with wings outstretched must be juveniles (uniformly fresh flight feathers).



Getting airborne with a belly-load of fish was quite an effort!





































A couple more taken into the sun.

I've just discovered this superb pic of a Sooty Shearwater, posted yesterday! It shows just about all the key differences from Short-tailed - the head, bill and eye, and underwing pattern.

500Club: James Eaton in 5-tick day shocker!

James's Peninsular Malaysia list shot up with 5 ticks in just 12 hours on Wednesday! How was this possible, you may ask? Details in the next post!

Shearwater revisited - possible Sooty?

I've had an email from Jeff Davies in Australia referring to the first of the shearwaters I saw on 27th April.



Jeff writes:

"It looks like a young Sooty to my eye.

Bill looks longish.

Outer wing long and tapering as opposed to more paddle shaped in Short-tailed which you undeniably had later in the day. Your bird is in a classic Sooty posture showing nice long tapered wings.

Wing tips flex up on downward stroke.

Underprimary area contrasting darker than coverts.Short-tailed under-primaries are reflective and tend to present pale like the coverts often with little or no tonal difference. Your bird shows the distinctive white blaze of a Sooty contrasting with dark primaries. This combined with the outer long and tapered wing shape is diagnostic. Note how the wing tip on the right side is flexed up, this is also diagnostic and very obvious when watching a bird go close by. When the under-primaries are reflective a little as in your ventral image the greater coverts always seem to stay dark and present as a short narrow arc away from the leading edge of wing. Your bird also shows this.

Young Sootys lack the obvious dark grizzled marks in the primary coverts, having streaks more like a Short-tailed that are not as easily seen from a distance."

I took quite a few photos of this bird, and include them all below, cropped but unedited, in the order taken.























The bird was seen early in the morning in low sunlight. It flew directly across the path of the boat, staying low to the sea surface, flight consisting of glides interspersed with bursts of powerful flapping. In the practically calm sea conditions we normally have, I would say that this flight mode is quite typical of Short-tailed Shearwaters we see here.

I'd love to hear more views on this bird from those familiar with both Short-tailed and Sooty Shearwaters. Please email me or make a comment on this post. Thanks