The average size of a mature giant Pacific octopus (Enteroctopus dofleini) is about 90 pounds (40.8 kg). Many have been discovered weighing 150 pounds (68.0 kg)! In addition to their size, these octopuses can be identified by a set of “horns” or skin folds that occur above their eyes. The females live for only three years and die after caring for their only egg batch. Males may live a year longer. The giant Pacific octopus is the largest octopus in the world and has a range that includes Japan, Siberia, and northern Alaska to northern Mexico.