Studies have shown that birds can pick up novel strategies for foraging within a bird community and pass them around through social networks until they become established behaviors. The classic example of this cultural learning was first noted in the British Isles in the 1920s: A group of great tits, a species known for its superb problem-solving skills, discovered that if they peeled off the foil cap from milk bottles left on doorsteps, they could glean a rich meal from the lovely cream that collects at the top.
