Icefish live in the Antarctic and we don't know a lot about them...but we just found out that 60 million...yes, million of them congregate to breed in the Weddell Sea.
They're the only vertebrate with no red blood cells. Instead, they dissolve oxygen directly in their plasma...which only works because cold water has lots of oxygen and they are ambush predators who don't move around much. And it may have something to do with the low iron content of their environment.
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