An icefish off the coast of Antarctica. Its body and blood is translucent. This image has been identified as one of the best pictures on Wikipedia. Image Credit: Wikimedia Commons

Crocodile icefish These Antarctic predators are unusual because their transparent appearance is due in large part to nearly invisible blood. They are the only known vertebrates in the world without hemoglobin, the protein in blood that transports oxygen.

Chaenocephalus aceratus - one of the 16 members of the icefish family. Image Credit: Bill Baker

Chaenocephalus aceratus - one of the 16 members of the icefish family.

A Pagothenia Bernacchi fish in the Ross Sea. Photograph by: Steve Rupp, National Science Foundation, Date Taken: March 10, 2008

A Pagothenia Bernacchi fish in the Ross Sea. Photograph by: Steve Rupp, National Science Foundation, Date Taken: March 2008

The translucent body of an icefish makes its brain visible from above. Image Credit: Herb Baker

The translucent body of an icefish makes its brain visible from above.

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