Octopus

It all depends on which species you look at. But most commonly when 1st born they are in fact the size of a grain of rice.

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The dumbo octopus, belonging to the genus Grimpoteuthis, has a fascinating life cycle that begins with the female laying thousands of eggs in deep ocean waters. After fertilization, the eggs are attached to a substrate and can take several months to hatch, depending on the environmental conditions. Once hatched, the juvenile dumbo octopuses are planktonic and drift in the ocean before settling to the sea floor as they mature. As they grow, they develop their characteristic ear-like fins and adapt to their deep-sea habitat.

An octopus has three hearts in its mantle (head-like structure). 2 pump blue blood to the gills that then deposits waste in the blood at the gills then the cleaned blood is pumped to the 3rd heart to be pumped through out the rest of the octopuses body.

What am i ment to upload a picture? Check on google images

It can change its colour in a blink of an eye