This Month in Photo of the Day: National Geographic Magazine Features

Corals build the rampart that shelters the landward provinces of mangrove and sea grass. The reef's calcium carbonate city teems with species, among them this spiny-headed blenny.

See more pictures from the October 2012 feature story "Meso Amazing."

See more underwater pictures from Brian Skerry's Ocean Soul »
Brian Skerry earns Emerald Award »