You could be closer than you think to an ambush hunter. Great barracudas live in much of Earth's salt water. With up to 20 razor-sharp fangs, these fish are predators. David Muir reports on some of ...

In today’s fast-changing world, where species are constantly evolving and many are disappearing, it’s fascinating to learn ...

Blood is often associated with the color red, but in the animal kingdom, it comes in a surprising range of hues. From the ...