Sperm Whale (Physeter macrocephalus) Eight-inch tooth from lower right mandible (jawbone) of an adult bull in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico.

Sperm Whale (Physeter macrocephalus) Adult fluke-up dive at sunset in Mid-riff region of the Gulf of California (Sea of Cortez), Mexico. (rr)

Sperm Whale (Physeter macrocephalus) Assorted teeth from lower jaws of beached Sperm Whales in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico.

Sperm Whale (Physeter macrocephalus) fluke-up dive at sunset. Mid-riff region of the Gulf of California (Sea of Cortez), Mexico. (rr)

Sperm Whale (Physeter macrocephalus) Woman with an eight-inch tooth from lower right mandible (jawbone) of an adult bull Sperm Whale in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico. Model released.

Sperm Whale, Physeter macrocephalus, calf, left unattended by adults, Gulf of California, Mexico