Dark grey to black on top and usually white on the belly. Humpbacks have very large, elongate pectoral fins, a small but prominent dorsal fin and a large, bushy blow (up to 5 m tall).
The large fins, dark tail with white underneath, active breaching and tendency to “hump” their backs and raise their tail out of the water before diving, distinguish humpbacks from other whales.
Adult humpbacks can reach a length of up to 15 m.
Humpbacks are generally active whales. When resting, they are often seen jumping spectacularly out of the water, rolling belly side up, or waving their tails and fins out of the water.
They have one of the longest migrations of any mammal and migrate alone or in temporary aggregations of usually non-related individuals.
Females with their new born calves often rest quietly at the surface.