Sea Animals Charm Page

Octopuses

All octopuses have head, called mantle, surrounded with 8 arms, called tentacles. All vital organs are located in their head. They have 3 hearts and their blood is blue in colour. This is because their blood is not iron-based like ours, but copper-based, the copper being more efficient in transporting oxygen in a cold, low-oxygen environment. It has eight long limbs protruding from a globe-shaped head (or mantle). Two rows of suckers line their tentacles and can sense taste. It has been shown that two of the limbs act more as legs, allowing it to walk across the sea floor and push off when swimming. The octopus also has the useful ability to regenerate a tentacle if it loses one. While their pigmentation is normally brown, octopuses may turn white, which shows fear, or red, which demonstrates anger. Octopuses are solitary animals who make their homes in rocks and coral or dig burrows. They scatter rocks and shells around their dens to hide them. They leave the dens only to eat or reproduce. Octopuses are invertebrates, which mean that they are boneless. Because of that, they can change their colour and texture of the skin to blend with environment and become invisible.

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