A juvenile polar bear (Ursus maritimus) skull, possibly predated by adult polar bear, in the Svalbard Archipelago, Norway, Arctic, Europe

California Gray Whale (Eschrichtius robustus) calf vertabrae on Isla Tiburon in the Gulf of California (Sea of Cortez), Mexico.

CT with an eight-inch tooth from lower right mandible (jawbone) of an adult bull Sperm Whale (Physeter macrocephalus), Gulf of California (Sea of Cortez), Mexico

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

Long-beaked Common Dolphin (Delphinus capensis) skull found on the beach at Isla Magdalena, Baja, California Sur. Pacific Ocean. Possible by-catch in purse-seiner?

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

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

CT measures (9'8") the lower right mandible (jawbone) of an adult bull Sperm Whale (Physeter macrocephalus) in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico. Model released.

Long-beaked Common Dolphin (Delphinus capensis) skull found on the beach at Isla Magdalena, Baja, California Sur. Pacific Ocean. Possible by-catch in purse-seiner?