The ocellated icefish you see above has a very unique blood: it's totally
transparent. Discovery News tells us:
The reason, say experts at Tokyo Sea Life Park, is that the Ocellated
Ice Fish has no hemoglobin, making it unique among vertebrates the world
over.
Hemoglobin is the protein found in every other animal with bones. It
is what makes blood red and is the agent that carries oxygen around
the body. [...]
Researchers believe the fish can live without hemoglobin because it
has a large heart and uses blood plasma to circulate oxygen throughout
its body.
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