Blue whales have smooth, hairless, skin that is greyish blue in color with a lighter underside and a series of pleats on their throats. There enormous long body is slim and narrow, which allows them to cut through the water with ease.
The biggest type of blue whale is the Alaskan blue whale .
blue whale
The blue whale is a filter feeder.
A whale is covered in a layer of 'blubber', a fat and flesh composite particular to whales, beneath an outer layer of thick, shaggy fur.
Blue Whale
they have very smooth body covering
One type of Blue Whale the B. m. intermedia, the Antarctic blue whale, is considered an Antarctic regional -- sea-based, animal.
A hammerhead's body covering is scales and skin.
The largest type of living whale is the Blue Whale. It is possible that there might have been another type of whale that was bigger but is now extinct - however the largest known extinct whales such as Basilosaurus - a whale-like cetacean - 40-65 ft (12-20 m) and Livyatan melvillei - an extinct toothed whale from the Miocene - 13.5-17.5 meters, were still smaller than the Blue Whale - up to 29.9 metres (98 ft).
Blue whales eat krill not crabs.
A vet.
skin :)