Joseph Castro Via Live Science:
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Often considered the smartest invertebrates (animals without backbones) on the planet, octopuses can use tools, unscrew jar lids and tightly control their body color to match their surroundings. They use this sharp intelligence especially in situations of survival — including when they are trying to avoid getting eaten by their hungry mates.
Octopuses come in all shapes and sizes and inhabit diverse regions of the ocean. There are about 100 different species of octopuses in the genus Octopus, and at least another 150 species in other genera, said Jennifer Mather, a cephalopod expert at the University of Lethbridge in Canada. Scientists have witnessed the mating behavior of only about a dozen species, she added.
The marine animals have very short lives, generally lasting only a few years long and sometimes as short as 6 months. They spend their youth alone, eating and growing before reaching sexual maturity.