Little penguins work together to hunt schools of fish to increase their chances of locating prey. However, once a capture is made, it's every penguin for himself.
While cats have evolved without the ability to taste sweetness, they have retained at least seven receptors that register bitter tastes. This may explain why they're such picky eaters.
After years of misidentifying Helmeted Woodpeckers, scientists from the University of Kansas have found that the bird has evolved with characteristics of larger competing birds in the Atlantic forest.