Sandra J. Raredon, Division of Fishes, National Museum of Natural History, Smithsonian Institution
This shot of a viper moray, a saltwater eel in the moray family, comes from a new exhibit at the National Museum of Natural History in D.C. called X-Ray Vision: Fish Inside Out
. Read more about it here
, or, better yet, just head to the museum. The exhibit'll be there until August.