It’s an octopus-eat-octopus world. Scientists have discovered that mating, male blue-lined octopuses will inject a powerful, ...

The love life of a male blue-lined octopus is tough. Like praying mantises and widow spiders, a female blue-lined octopus will often kill and eat the male after mating. It's just a circle of life ...

which confirmed the octopuses could distinguish the two individuals, despite the fact they wore identical uniforms. Many male octopuses lack external genitalia and instead use a modified arm, called a ...

(CNN) — Male blue-lined octopuses inject a powerful neurotoxin into the hearts of females before mating to avoid being eaten, according to a new study. The males have evolved to use a venom ...

This octopus species lives in open water in Earth’s tropical and subtropical seas. It’s not the easiest place to find a mate, especially since the male is tiny—less than three-quarters of an ...

When a blanket octopus swims, it creates a kaleidoscope of colors twirling underwater. It’s a rainbow of beauty as it glides ...

This story ran in the April 2016 issue of National Geographic magazine. In most octopus species it’s customary after sex for the female to make a meal—of her partner. To avoid being eaten, the ...