Octopus: Children's Animal Fact Book

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You might have heard of the octopus, but did you know some interesting facts about them? Octopuses are eight-limbed molluscs that belong to the order Octopoda. These creatures are classified with cuttlefish, squid, and nautiloids. They live in seas, lakes, and rivers. In addition to the facts below, you can also read about their biology, diet, and even their names. Octopuses have a complex and large brain. They have a central brain and eight "mini brains, " each controlling one leg and arm. The octopus has no bones, but its brain is covered with pigment. It can also differentiate between humans and other animals. Octopuses are the world's smartest invertebrates, with the highest brain-to-body mass ratio. Most vertebrates have only one heart. Octopuses have three. One heart pumps blood to the gills, while the other two circulate blood throughout the body. The copper-based blood is more effective at transporting oxygen in cold waters than hemoglobin. That's why scientists are concerned about the state of the oceans caused by climate change. The oceans are already acidified. And that could be bad news for octopuses. Although octopuses have been used as inspiration for many monsters, they are still a tasty treat. In addition to the Kraken, the monster is often portrayed in many films. Other famous octopus-inspired monsters include Kanaloa, Cecaelia, and Akkorokamui. While octopuses are not endangered, they are harvested for their meat and used for food. However, overfishing threatens their populations.