Some Whales Have Hair!
Only some species of whales have visible hair after birth, most notably the boto. Botos have stiff, whisker-like hairs on their beaks that may help them to find food at the bottoms of the rivers and lakes where they live. Some baleen whales, such as the humpback, can have hairs on their snouts, too. The hair on fetal whales is called lanugo, and typically disappears after birth. Humans also have lanugo on their bodies when they're in the womb!
from Stated Clearly
Key Facts In This Video
Many whales have hair when they're young. (2:40)
Maiacetus had strong enough legs and hip bones to walk on land, but is considered a whale. (6:13)
Whales and hippos are among the only mammals on Earth that have internal testicles. (8:51)