The octopus is built so differently from familiar animals that it can seem almost designed to break the rules of biology. It ...

An octopus is built so differently from the animals people know best that it can seem less like a fellow inhabitant of Earth ...

Octopuses have three hearts, which is partly a consequence of having blue blood. Their two peripheral hearts pump blood through the gills, where it picks up oxygen. A central heart then circulates the ...

Did you know octopuses are highly intelligent animals with the ability to problem-solve complex puzzles – and even change color? They have three hearts and blue blood, helping them survive in deep ...

They change shape and color, and squirt ink. But they also will return your gaze, "as if they're scrutinizing you." ...