One of the most intelligent invertebrates on the planet, octopuses are a unique animal with a wide range of interesting adaptations. Not only are they incredibly smart, but they have no internal or external skeleton, allowing them to squeeze through or into tight spaces!
Although you might not think it by looking at them, octopusesactually have very keen eyesight and sense of touch. Their eyes candistinguish polarization of light, and many species of octopus caneven see color. Not only that, but the suction cups on their armsare actually able to taste what the octopus is touching!Fortunately, many species of octopus are not considered threatenedor endangered, although some niche species are currently consideredvulnerable.