Octopuses in Antarctica survive subzero temperatures because of blue pigment in their blood, a new study finds. The ice-cold temperatures in the Southern Ocean surrounding Antarctica range between ...

When we think of blood, the colour red usually comes to mind. But in the animal kingdom, some creatures have blood that ...

Imagine a creature that has three hearts….Surprised? Well, imagine that it also has nine brains and blue blood. Sounds like something from a sci-fi movie, right? But what if that’s actually true?

Their blue blood contains hemocyanin, which turns blue when it binds with oxygen. Their blood can appear purple due to the presence of a pigment called hemerythrin, which is purple when oxygenated.