Blue tits vs willow tits: a lesson in subsidies
I last saw a willow tit on my farm about a year ago. I’m searching for them again this spring, listening for their ‘chair chair’ calls, but I am worried that they may be extinct here. They are dying out everywhere: down by 92 per cent nationwide in the 50 years from 1967. And the reason is not pesticides or climate change or agriculture or habitat loss. It’s blue tits. Willow tits have never taken to visiting bird tables, but blue tits love them. So come the spring, hordes of peanut-fattened blue tits fan out across the countryside looking for nesting holes and – hey presto – they find the little hollows that willow tits have been laboriously excavating in rotten birch trees and, being more aggressive, steal them.