Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

Denise's pygmy seahorse isn't a wanderer. Individuals typically spend their entire adult lives on a single coral colony. Over many generations, this lifestyle has allowed natural selection to ...

Pygmy seahorses (Hippocampus bargibanti) are masters of camouflage. They are among the smallest vertebrates, just the size of a thumbnail, and live in coral reefs in the western Pacific. There they ...

(CNN) — Pygmy seahorses, about the size of a fingernail, are some of the smallest vertebrates in the world. First discovered in 1969, little was known about the creatures. But in the early 2000s, ...