1. Cetaceans

2. 2 Families Odontoceti (toothed whales) Mysticeti (baleen whales)
67 species
One opening for blowhole
Mysticeti (baleen whales)
11 species
Two openings for blowhole

3. Teeth
Toothed whales have teeth which are numerous and peg-like, although sometimes modified, as in the single tusk of the narwhal or the odd, fanglike lower teeth of the beaked whales.

4. Teeth
Baleen whales lack teeth completely as adults (although teeth are present in fetal baleen whales). They feed by straining small marine organisms out of the water using plates of baleen, a hornlike substance that forms filaments that hang down from the roof of the mouth.

5. Reproduction All species produce a single offspring at a time
The female delivers usually a single calf tail-first to minimize the risk of drowning.
Milk is so fatty that it has the consistency of toothpaste

6. Balaenidae
Bowhead Whales
Right Whales

7. Rorqual
Humpback whales
Blue whales
Fin Whales
Minkie Whales

8. Eschrichtiidae
Grey Whales

9. Neobalaenidae
Pygmy Right Whales

10. Delphinidae
Dolphins

11. Monodontidae
Belugas
Narwhals

12. Phocoenidae
Porpoises

13. Physeteroidea
Sperm Whales

14. Platanistoidea
River Dolphins

15. Sound
Most whales have generally poor vision (exept dolphins which have acute binocular vision).
To make up for it cetaceans have excellent hearing.
Because sounds travel farther and faster in water whales can communicate to each other at far distances.

16. Baleen whale songs
All the whales in an area sing virtually the same song at any point in time and the song is constantly and slowly evolving over time.
Unsure why they sing but most agree it is used for sexual courtship.
Only males sing
Do not have vocal cords, how they make the sound is unknown.

17. Toothed whale echolocation
Have a highly adapted echolocation adaptation
Use it to see their surroundings as well as communicating between individuals
Can use the intense sounds to immobilize small prey

18. Intelligence
Studies into dolphin behavior have highlighted how similar their communications are to those of humans and that they are brighter than chimpanzees.

19. Intelligence Baleen whales also exhibit a high level of intelligence.
Have the ability to migrate thousands of miles