This towering Great Dane and his pint-sized Chihuahua brother may be two wildly different dogs, but they have formed an ...

Do purebred cats exist, or is the terminology used to describe cats not mixed with other breeds incorrect? Our expert weighs ...

The weirdest-looking moths on Earth are so strange, they look like they flew straight out of a vivid dream — or a nightmare.

While maybe not quite as well-known as its famous neighbor Yellowstone, Grand Teton National Park attracts several million ...

A paleontologist explains the latest science about Troodon formosus, and whether it was really the smartest dinosaur.

Some experts believe that we're already in a sixth mass extinction event, but given the numbers, others aren't so sure.

The United States is fortunate to contain numerous rivers teeming with life – including fish, amphibians, birds, mammals and ...

When people imagine the king cobra, they usually think of its hooded neck, its upright stance, and its potential to kill with ...