Recently we received a blackcap at the centre. A quite distinctively male warbler with grey body feathers, brownish upper parts and a black head (females have a chestnut coloured head). These small birds feed mainly on insects during the breeding season. The extra protein is necessary for the egg-laying and rearing of nestlings. From July they switch to fruit, in particular berries, as the sugar helps them fatten-up for the migration.
The bird was found on the street, unable to fly. During the check-up it seemed that the wing and tail feathers were sticking together with something that seemed rather purple... Berry-jam perhaps ? I guess we will never know for sure. But it does seem very suspicious.
The feathers were washed and after a short stay he could be released.