The sperm whale is an awesome creature, a true beast of the deep. Diving up to 1000 feet beneath the surface to hunt, able to do so because their rib cages are able to fold in on themselves.
If our whale has just come up from a dive she first spends 10 minutes or more clearing her lungs, blowing a breath in and out every 12 seconds. She's getting rid of old carbon dioxide from the last dive and loading up with fresh oxygen. She's got to store up a lot of oxygen because . . . More