When giant Pacific octopuses lay eggs, they lay a lot at once: thousands upon thousands. The mother often dies after her eggs hatch, so she has to lay many and take good care of them to make sure her line continues.
After mating, the mother will hide in a rock crevice for up to a year, not even eating, while she blows oxygen over her eggs and keeps them clear of algae. Then: they hatch.
This video shows octopus eggs hatching in the wild, and the tiny hatchings that will drift in the current as plankton before just a few make it to adulthood.
Read a full blog post at Scientific American.
Video by Laura James