Species of deep-sea gold coral, or Gerardia, often have a tree-like shape, as you can see in this specimen. See more pictures of coral in our Deep-sea Corals article.

Black corals, like this one growing on the Manning Seamount off the New England coast, often resemble bushes or trees. Contrary to its name, the living tissue of black coral can be one of several colors. It’s the skeleton that is black. See more pictures of coral in our Deep-sea Corals article.

This bubblegum coral (Paragorgia arborea) has a fanlike shape. It is growing 1,310 m (4,298 ft) deep on the Davidson Seamount southwest of Monterey, California. Learn more about deep-sea corals in the multimedia feature "Coral Gardens of the Deep Sea."

The pink strands of this single deep-sea coral harbor a variety of marine life. Sea whips are gorgonian corals and have flexible skeletons. See more pictures of coral in our Deep-sea Corals article.

Red tree corals like this Calyptrophora bayer can grow several meters high and resemble brightly colored trees. This one was found 1,683 m (5,522 ft) deep on the Davidson Seamount. See more pictures of coral in our Deep-sea Corals article.

A fan-shaped colony of red coral (Corallium sp.) on the Davidson Seamount provides a perch for three basket stars as they feed. See more pictures of coral in our Deep-sea Corals article.

This 200-year-old bamboo coral colony is growing on the Davidson Seamount off the coast of California. The skeleton of this deep-sea coral has bamboo-like segments. See more pictures of coral in our Deep-sea Corals article.