Like dolphins, crows, and chimpanzees, octopuses are part of a special class of animals that can use tools.[octopus]
The largest octopus in the world is the Pacific octopus, Enteroctopus defleini. It weighs up to 33 lbs (15kg) and has an arm span of up to 14 ft (4.3 m). It also has three hearts and nine brains.[octopus]
Octopuses can change their appearance in less than 30 milliseconds. They change colors by expanding tiny pigment sacs in their skin called chromatophores.[octopus]
An octopus's appendages are called arms, not tentacles.[octopus]
Octopuses have a special arm for mating. During mating, the male octopus uses its "hectocotylus" to insert sperm into the female. They have been observed holding this special limb close to the body while foraging, possibly to protect it.[octopus]
The blood of octopuses (and other mollusks) is blue because of the oxygen-carrying pigment called hemocyanin.[octopus]
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