Huge Humpback Whales

It's hard to tell the size of a humpback whale due to the fact that we never get too close to them, however, for comparison's sake, a humpback whale is about the size of a city bus.

Picture from The Sea Monster

Fully grown, most humpback whales measure 40 to 50 feet in length and weigh between 20 and 40 tons.  Females are slightly larger than males and newborn calves are roughly the length of their mother's head.