hibernating

When food is precious, animals can resort to strange behaviours in order to satisfy their hunger. Take the great tit. Its usual diet of insects and creepy-crawlies is harder to come by in winter. But in one Hungarian cave, great tits, ever the opportunists, have learned to exploit a rich and unusual source of food. They kill sleeping bats. Great tits are only about 5 inches long, but their prey - the pipistrelle bat - is smaller still, just an inch or two in size. The bats spend the winter months hibernating in rock crevices. They're well hidden, but when they wake up, they start making…