One heart pumps blood throughout the body and the other two move blood to the gills, according to the nonprofit National Wildlife Federation. Like some other marine animals, octopus blood is blue.

Deep in the ocean’s cold, dark waters lives a species of wide-eyed octopus that will surely warm your heart with pure cuteness ... dark aquariums in order to study their internal and external anatomy.

Figure 1: Octopus anatomy and gene family representation analysis. Mechanisms other than whole-genome duplications can drive genomic novelty, including expansion of existing gene families ...

Octopuses have three hearts. One heart pumps blood throughout the body and the other two move blood to the gills, according to the nonprofit National Wildlife Federation. Like some other marine ...