Changes

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

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

* whales, along with humans and horses, are some of the few mammal species that do not possess [[baculum]] (penile bone)

* whales, along with humans and horses, are some of the few mammal species that do not possess [[baculum]] (penile bone)

* some have two blow-holes, but others only have one

* mysticetes have two blow-holes, while odontocetes only have one

* the blow-holes pass air above water, yet resist intense pressure underwater

* the blow-holes pass air above water, yet resist intense pressure underwater

* they have massive brains, much larger than the brains of other mammals

* they have massive brains, much larger than the brains of other mammals

=== Taxonomy ===

== Taxonomy ==

There are two kinds of whales: toothed whales of the suborder Odontoceti, and whalebone (baleen) whales of the suborder Mysticeti.

There are two kinds of whales: toothed whales of the suborder Odontoceti, and whalebone (baleen) whales of the suborder Mysticeti.

*'''Suborder Mysticeti: Baleen whales'''

*'''Suborder Mysticeti: Baleen whales'''