Mermaids

In the past, many times sailors understood beluga whales to be mermaids for one very common reason, ie, blubber to protect themselves against the freezing waters. The blubbers make visible tracks along their belly both sides to store the extra fat. But their heads are free of fats so it ends up giving them a look of the chubby body and little moving head, unlike other whales whose head stays still with their bodies. They can amuse one with their facial expressions which help in detailed communication between these social mammals. They definitely are an odd one out sea creature with their distinctive features.