1. Male right whales have a higher density of callosities than females. 2. Male right whales have bigger callosities than female right whales. 3. Bowhead whales completely lack callosities , the easiest way to distinguish the two species. 4. Large head covered with bumps ( callosities ) 5. The evolutionary purpose of callosities is unknown. 6. The columella is nearly straight, covered by the inner lip which forms a callosity . 7. The edge of the callosity is always of a more or less deep orange color. 8. Whale louse infestations are especially evident in right whales, where colonies propagate on their callosities . 9. The six columella is wrinkled and covered at its base with a thin, raised callosity . 10. In them the lip is thin, smooth, and the callosity does not exist upon the columella.
