WordNet sense 1 (medium-sized greyish-black whale of the northern Pacific):

grey whale, Eschrichtius gibbosus, Eschrichtius robustus, gray whale

WordNet sense 2 (bottom-living cephalopod having a soft oval body with eight long tentacles):

octopus

WordNet sense 3 (extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned):

manta, manta ray