Sperm whales, the largest of the echolocating whales, have powerful sonar ability, says a new book that looks at the history of whales, including their evolution.
Echolocating whales like this sperm whale use a fatty structure atop their heads to project sound waves externally, which then bounce off of objects and return an image.
Whalers cut open a fin whale off the coast Iceland. Some cultures continue to whale, even though their populations may not eat whale meat anymore.