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 ...

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 ...