露脊鯨
Each individual has a unique callosities pattern. In 2016, a competitive effort resulted in the use of facial recognition software to derive a process to uniquely identify right whales with about 87% accuracy based on their callosities. The primary role of callosities has been considered to be protection against predators. Right whale declines might have also reduced barnacles. Right whales are very large, robust whales that can grow up to and over long and weigh up to , almost as big as bowhead whales and much larger than other species with high dependencies on shallow waters. An unusually large 40% of their body weight is blubber, which is of relatively low density. Consequently, unlike many other species of whale, dead right whales tend to float. Right whales swim slowly, reaching only at top speed. However, they are highly acrobatic and frequently breach (jump clear of the sea surface), tail-slap and lobtail.