What are the tallest trees in the world? These 10 skyscraping superstars are some of the stalwart examples of their species.

Zoos ensure the survival of threatened and endangered species through captive breeding, reintroduction programs, education, and field conservation.

11 Animals That Have a Sixth Sense Additional perceptive abilities allow animals to experience the world in ways we can't imagine.

Want to know what's ailing nearby trees? This index of common tree diseases and pathogens can help you identify and prevent further decay.

10 Examples of Animal Species Working Together in the Wild These partnerships show how animals rely on one another to survive ...

Raccoons eat pretty much anything and live pretty much anywhere. Discover 11 interesting facts about these masked critters.

A U.S. EPA report stated that 55% of U.S. rivers are in bad condition. View this beautiful interactive map for inspiration to protect these waterways.

10 of the Largest Insects in the World These insects are big enough to give even seasoned entomologists a good fright.

Do dogs like to be petted? Generally yes, but not on the face. Here are other things dogs hate—including some you may be doing them without realizing.

This massive stretch of forest plays a significant role in the planet's biodiversity and even its climate.

What Is a Crepuscular Animal? Animals like rabbits, house cats and deer are neither nocturnal nor diurnal. Instead, they're crepuscular.

Even after nurturing and enchanting humans for thousands of years, the Nile River is full of surprises—and the longest river in the world.