FOE some years now I have been paying particular attention to the nestlings of common birds. It is of course now known to all ornithologists that the parents keep the nest clean (as a general rule) by carrying away the excrement, and often by swallowing it, during the early part of the nestling-period. While watching these operations I noticed that, after feeding the young, the old birds almost a...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now