Members of the Corvid family, which includes ravens, crows, magpies and jays, are highly intelligent. They have complex social structures, can remember human faces, judge the fairness of a deal and will hold grudges against people that they feel have treated them unfairly. ¹⁾.

Flamingos can eat only when their head is upside down. ²⁾

Hummingbirds are the only known bird species that can fly backward, upside down, and hover in the air. This ability makes it possible for hummingbirds to sip nectar from flowers. ³⁾.