From sleeping with polar bears, penguins and Siberian tigers to safaris following rare species such as black rhinos, the best zoos in Europe offer unexpected surprises and a trove of fun and ...

Certain species have been filmed emitting strange alarm-type sounds. Animals are literally raising the alarm. Certain species, reported in a new video released today by WWF, Birdlife, EEB and Friends ...

Editor’s note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Of all 14,669 varieties of plants and ...