Scientists estimate there are about 4,000 species of native bees in the U.S.—and they’re both cooler and ecologically more ...

Critics of the idea that the North American wild horse is a native animal, using only selected paleontological data, assert that the species, E. caballus (or the caballoid horse), which was introduced ...

This enormous area of the Great Plains, Southwest, Pacific Northwest ... North American Indians shared their world with two types of buffalo (plains and wood), eight species of bear, three ...