Arguably the world's most abundant animal, calanoid copepods can leap like whoa Nelly. And check out their enigmatic embryos!

Just as the ocean is full of plankton, the air we breathe teems with microorganisms.

Bioluminescence, an animal's ability to create and use light, exists exclusively in the lower branches of the tree of life.

El Niño is a complex series of weather patterns that arises in the Pacific, influencing weather phenomena around the world. But what's it doing to plankton?

In 1961, G. E. Hutchinson first outlined what he called the paradox of the plankton. Over 50 years later, it may be solved.