To know what a tropical bird is, you first have to know where the tropics are. The tropics form a band around the equator ...

These people may have been inspired by animals they observed in nature, where there are many birds with mohawks that rival ...

The great-tailed grackles are originally a Central American species, and now they're on the move. "In the 1800s, they barely touched Texas," Clark said. Now they "increase the area they occupy by ...