22 Families Odontoceti (toothed whales) Mysticeti (baleen whales) 67 speciesOne opening for blowholeMysticeti (baleen whales)11 speciesTwo openings for blowhole
3TeethToothed 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.
4TeethBaleen 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.
5Reproduction 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
15SoundMost 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.
16Baleen whale songsAll 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 singDo not have vocal cords, how they make the sound is unknown.
17Toothed whale echolocation Have a highly adapted echolocation adaptationUse it to see their surroundings as well as communicating between individualsCan use the intense sounds to immobilize small prey
18IntelligenceStudies into dolphin behavior have highlighted how similar their communications are to those of humans and that they are brighter than chimpanzees.
19Intelligence Baleen whales also exhibit a high level of intelligence. Have the ability to migrate thousands of miles