The jetty that brought such success in the spring now has a ring of mangrove saplings round it that effectively act as a barrier to waders, which are generally paranoid about enclosed spaces.
I try to take a lot of pictures of waders when they are preening, since many feathers are exposed which are normally kept hidden. In this picture, you can see the beautifully fresh edges of the flight feathers, and the ‘anchor-shaped’ subterminal markings on the inner greater coverts. This pattern is common to juveniles of a number of wader species.
Even without seeing this kind of detail, juveniles can often be distinguished by their very neat and tidy appearance, an effect caused by the fact that all the feathers are of uniform age.
This is the range I was viewing most birds at! I’ve included this shot as it shows a Greater Sand Plover still mostly in breeding plumage. The majority of Greater Sand Plovers complete their post-breeding moult before beginning migration, so it is fairly safe to say that a sand plover showing breeding plumage on southward migration is a Lesser. But nothing is failsafe in birding – there’s always the exception which proves the rule!
Also staying outside the mangrove circle were three adult Asian Dowitchers. Dowitchers are among the earlier wader species to arrive on Malaysian shores. In 2009, there were juveniles in Penang by 23 August!
As the tide rose, instead of coming closer, along with almost all the other waders, they flew past my watchpoint to somewhere else tantalizingly out of view!
Only a few Terek Sandpipers stayed behind, chasing crabs. I shot a video of one in action.
Terek Sandpiper hunting. When it catches a crab, it deftly takes the prey by one leg and then shakes it till the leg is removed. Discarding the detachment, it then picks up the crab by another leg and repeats the process until the crab is literally disarmed. It eats the body of the crab, then goes back and retrieves and eats each discarded leg. I’ve watched Whimbrels, Common Sandpipers and Greater Sand Plovers adopt the same approach when swallowing medium or large-sized crabs. I guess a crab could do some damage if it was swallowed with legs still attached.
Here are a few other videos I’ve uploaded recently:
A juvenile Greater Sand Plover, initially with a Common Redshank, then with an adult and three juvenile Lesser Sand Plovers. 15 August 2013.
Juvenile Lesser (left) and Greater Sand Plovers do some synchronized predator avoidance, probably in response to an overflying House Crow. Check out the difference in proportions between the two species.15 August 2013.
A juvenile Greater Sand Plover in a typical crouched, crab-hunting run. I don’t believe Lesser ever does this.13 August 2013.