LifeGreat tits avoid bad food after seeing grossed-out friends If a great tit eats something nasty, it will disgustedly wipe its beak on a branch – and other great tits watch and learn ¿ìè¶ÌÊÓÆµ
LifeHummingbirds have massive hearts to power their hovering flight Birds that hover in front of flowers have huge hearts to power their energy-intensive flight, and even birds that glide effortlessly need fairly big hearts to keep it up ¿ìè¶ÌÊÓÆµ