The sex lives of octopuses is often difficult to photograph in the wild, however Dr. Roy Caldwell got very fortunate with a pair in his lab. Here are some very rare pictures of the Abdopus aculeatus octopus mating, with a photo by photo explanation of what is happening.
posted by quin on Feb 25, 2013 - 54 comments

Octopus versus Sea Lion
posted by Artw on Apr 10, 2010 - 47 comments

I am a giant squid. I swam up from the briny ocean depths. I have a computer, with a specially-modified tentacle-friendly interface. I have a fast internet connection. I seek to learn about humans and about the world. I have read much on the internet. Yet still, I have many unanswered questions. And you must have questions of me. We have much to learn from one another. To this end, I have developed the assortment of quizzes, games and activities you find before you. They form part of my ongoing campaign to facilitate improved human-squid relations. Try them out, you will most certainly learn something about squid.
posted by Rhaomi on Apr 5, 2010 - 42 comments

By popular demand, your new resident marine biology nerd has compiled some cool information about the Giant Pacific Octopus.The Giant Pacific Octopus (Octopus dofleini) is one of the strangest animals in the sea- and one of the smartest. Though it is commonly believed that vertebrates are always "smarter" than invertebrates, these guys defy that convention. As this video shows, they are able to easily open jars and retrieve food from inside. They are also, as the "Giant" implies, enormous- the biggest one on record was 30 feet across (according to National Geographic) [more inside]
posted by WhySharksMatter on Jul 6, 2009 - 140 comments

Camouflaged and Walking octopuses Octopus marginatus and Octopus (Abdopus) aculeatus, that walk along the seafloor using two alternating arms and apparently use the remaining six arms for camouflage.
posted by dov3 on Mar 30, 2005 - 23 comments