Changes

A whale (cetacean) is a massive mammal that lives in the ocean.  It relies on fresh air just like other mammals, and unlike fish.  The whale is warm-blooded like animals, and unlike fish.  But whales have many extraordinary features that ''not like'' other mammals, including:

A whale (cetacean) is a massive mammal that lives in the ocean.  It relies on fresh air just like other mammals, and unlike fish.  The whale is warm-blooded like animals, and unlike fish.  But whales have many extraordinary features that are ''not like'' other mammals, including:

* they decide when to breathe, rather than breathing unconsciously

* they decide when to breathe, rather than breathing unconsciously

* the females nurse their calves while swimming underwater

* the females nurse their calves while swimming underwater

* the nursing calves are somehow able to avoid intaking saltwater while nursing

* the nursing calves are somehow able to avoid taking in saltwater while nursing

* the males have a unique cooling system for their internal reproductive organs

* the males have a unique cooling system for their internal reproductive organs