Wondernose: What animal has flippers that are up to fifteen feet long?

Wondernose: What animal has flippers that are up to fifteen feet long?

Humpback whale. Photo © Dreamstime.com. Flippers. That makes you think of seals and sea lions. Is the answer to our riddle some kind of huge sea lion, you ask?No. Unlike the sea lion, our mammal never crawls out of the water. Its flippers (pectorals) are very helpful...