The last sighting of the glass octopus was in 2021, and scientists still don't know much about this highly elusive species.

Photographed at Florida Keys Marine Life Just as humans are mammals, octopuses are cephalopods. The word is Greek for “head-foot” and refers to their weird anatomy, by which their arms are ...

How can the soft bodies of coleoid cephalopods so aptly hide in their environment? Why must they? What cells and specialized organs make such crypsis possible for one of the older evolutionary ...

For a long time, it was considered a deep-sea phantom, but researchers have now succeeded in filming a colossal squid in its natural habitat for the first time. These creatures can weigh up to 1,100 ...

Drawing on over 300 scientific studies, we have evaluated the evidence of sentience in two groups of invertebrate animals: the cephalopod molluscs or, for short, cephalopods (including octopods, squid ...