Mermaid or beluga whale?

According to the excellent wunderkammer of Twitter accounts, We Like To Learn, "Throughout history, sailors have mistaken Beluga Wales for mermaids because of their human-like knees."

(As our helpful commenters point out, those aren't literally "knees" in the image but rather love handles that help the whales steer as they swim. More here.)

(via Daily Grail)