Toothed whales
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Toothed Whales . By: Lauren Granville. There are around 70 different species of Toothed Whales. They get the name, Toothed Whales, because they are the only whales that have teeth. Some Toothed Whales are: Sperm, Bottlenose, river dolphin, Orca, Pilot, Narwhal, Beaked, and Beluga. .

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Toothed Whales

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Toothed Whales

By: Lauren Granville


  • There are around 70 different species of Toothed Whales.

  • They get the name, Toothed Whales, because they are the only whales that have teeth.

  • Some Toothed Whales are: Sperm, Bottlenose, river dolphin, Orca, Pilot, Narwhal, Beaked, and Beluga.


  • There is a wide distribution of Toothed Whales all over the world.

  • They can be found in deep water habitats, coastal shores, in Antarctic seas, tropical seas, and in freshwater, like the Amazon river dolphin shown below.

  • Most migrate for food or to breed, while others, like the Sperm whale, are said to be the wanderers of the ocean, because they inhabit all oceans of the world.


  • Their diet varies among the different species

  • Actively hunts prey using echolocation

  • Toothed whales have peg-like teeth for grasping their prey

  • The ones that feed on fish, seals, and other whales, like the Orcas, generally have more teeth than the ones that feed on invertebrates.

DIET


  • Orcas will strand themselves in order to catch and eat seals from a sandy beach.

  • Bottlenose dolphins will herd schools of fish up onto a mud bank, stranding themselves until they are finished.

Feeding Methods


  • The melon is a fluid-filled structure, unique to Toothed whales.

  • Its located between the blowhole and beak and is believed to function in echolocation.

  • They use the melon as an adjustable acoustic lens.

The melon


  • The blowhole is usually located on the top of the head, except for in the case of the Sperm whale.

  • Sperm whales have a blowhole that is located on the front left-hand side of the head.

  • These whales are the largest in this group and are known to have the largest brain of any animal with a weight of 20lbs.

Sperm Whales


  • This group is mostly made up of smaller whale species that includes dolphins and porpoises.

  • Dolphins and porpoises are aesthetically similar. Dolphins are more talkative and make whistling sounds through their blow holes for communications; porpoises do not.

  • Both are very intelligent.

Dolphins and Porpoises


  • This family, Monodontidae, has only two species: the Narwhal and Beluga whale.

  • Found in arctic seas and major rivers draining into them.

  • Both lack a dorsal fin.

  • Belugas have 8-10 teeth in each jaw; Narwhals have only two in the upper jaw, one develops into a spiral tusk.

Narwhal and Beluga


  • Whether whales sleep or not remains a mystery.

  • Because breathing is not an automatic reflex in whales and is a voluntary one, scientist believe they rest one side of the brain at a time.

  • Scientist believe they do this by closing one eye at time before swapping to the other eye while swimming close the waters surface.

Do whales sleep?


In Provincetown


  • http://www.kidcyber.com.au/topics/whaletooth.htm

  • http://www.whalesalive.org.au/aboutwhales.html

  • http://marinelife.about.com/od/whaleanddolphinwatching/p/WhaleWatchingShoreCapeCod.htm

  • http://www.coastalstudies.org/what-we-do/stellwagen-bank/toothed-whales.htm

  • http://animals.about.com/od/cetaceans/p/toothed-whales.htm

  • http://www.mobilecape.com/oldsite/whales.html

Refrences


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