Longest-living animals have built amazing traits to slow, halt, or even reverse their age. Species like immortal jellyfish ...

While human females carry a child for nine months, some animal species have pregnancies that last years. Here are 6 animal ...

Elephants are among the smartest, largest animals on the planet. With all that size and brain power, it should come as no ...

Other rare species reach ages marked in centuries, and each class of animals boasts individuals that are unusually long-lived compared to their peers. Aging wild animals isn’t always easy—they ...

Brown bats can sleep for over 20 hours due to lack of food. They are only active for 4 hours at night. Chipmunks have tendency to sleep over for 15 hours to stay safe in their hidden shelters ...