(photo from Pete Blanchard on Flickr)
Blue tits are pretty awesome when they get hungry:
“In the 1940s, when milkmen still delivered their milk in glass bottles to residents’ doorsteps, it was reported that blue tits had figured out how to pry open the milk caps to get to the fresh layer of cream on the surface.
Bat ecologists Péter Estók and Björn Siemer discovered that great tits hunt a species of bat called the common pipistrelle. They had taught each other how to use the waking call of pipistrelles to track them down, wrench them from their cave roosts, and crack open their skulls to feed on their brains.”