Talkback: Wasps and cuckoo bees
Hello Richard,I saw my first swift today here in
Ewell, it's the first since 31th July last year.How do they know when it's the end of July and time to leave.
They leave as soon as their young are fledged. They never land except to breed.
The swifts finally arrived on 11th May, at least a week later than usual. Pah. Fairweather travellers.