| The single blowhole is located well to the left of the midline and far forward on the head. |
| When they dive, muscles close the blowhole and their ribcage collapses to keep air bubbles from forming in the bloodstream. |
| In any case, be careful to leave the blowhole free so that the animal can breathe. |
| A calf will hump up onto the back of the sleeping mother, breach onto her, cover her blowhole with his tail. |
| When warm air shoots out of the blowhole, it cools as it comes into contact with the outside air. |
| This can probably be attributed to the top blowhole wicking away the rising hot air. |
