Do sperm whales sleep? It's not a question that gets asked frequently, but when it does, none is the wiser to answer it. That's until now, of course, because now we have photo proof of just how these ocean giants nap.
Do sperm whales sleep? It's not a question that gets asked frequently, but when it does, none is the wiser to answer it. That's until now, of course, because now we...
