To know what a tropical bird is, you first have to know where the tropics are. The tropics form a band around the equator bordered by the Tropic of Cancer in the north and the Tropic of Capricorn in ...

Hot and dry deserts get less than 10 inches of rain a year. They have flat, rocky areas and rolling sand dunes. Plants here have thick, hard coatings that can store water.

Small bands of Homo sapiens made a few failed forays leaving our home continent before the species finally managed to launch a major dispersal out of Africa roughly 50,000 years ago, going first into ...

A thin layer found in the top few centimeters of soil plays a big role in its ecology. Biocrust is built, maintained and ...