They're the world's largest marsupials, they hop to get around, and they use their tails as a fifth limb. But they're also ...

In evolutionary terms, fitness is defined as an organism's ability to survive and reproduce its genes into the next ...

In fact, social monogamy is extremely common in birds and somewhat common in mammals, while sexual monogamy is vanishingly ...

Some Marvel villains made their way out of comic book pages to stoke real-life controversy due to unfortunate storylines.