Saturday, 5 June 2010

Prey ID please

I wonder if anyone can ID the grub in this Common Whitethroat's beak, at first I thought it was a fecal sack, however it was clearly alive and wiggly, both adult Whitethroat's bought several back and stuffed them down the necks of their hungry brood!


Nicholas said...

Not certain but it could be a spiders egg case full of baby spiders.


equoox said...

I agree with Nicholas, it does look rather like a spider's egg sac which, when being squashed by the beak, has split letting a spiderling or two escape, hence the wiggly legs .... but it is not that clear with the magnification allowed.