Whale Shark Although whale sharks are massive, they are generally docile and inoffensive to humans. Whale sharks are even sometimes nice enough to let human swimmers hitch a ride.
Learn more about the Whale Shark.
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Scientific Name: Physeter macrocephalus
Other Names and/or Listed subspecies: Cachelot, Pot Whale, Spermacet Whale, Physeter catodon
The sperm whale is found in the deep waters of the oceans, from the Arctic to the equator, and it can also be
found in the Mediterranean Sea. It is easily identifiable because of its distinctive shape and unusually large and
box-like head which can reach up to 20 feet long (up to 1/3 of its body length). Its scientific name macrocephalus
is derived from a Greek word, meaning "big head." It is common for the head of the sperm whale's head to be covered with
circular scars made by the suckers of giant squids that the sperm whales enjoy hunting and eating. Male sperm whales can
reach up to 65 feet in length and weigh between 40 and 50 tons. Females are much smaller, reaching only 39 feet and
weighing only 18 tons. The skin is gray to black in color, and some albino sperm whales have been observed.
The sperm whale was given its common name because of a white milky substance found in the head that was once thought to
be sperm by whalers. Biologists still do not know what the purpose of this substance is, but some believe it serves as a
liquid weight to help the whales sink easier when ready to dive deep into the water. The blowhole slit is S-shaped and
found on the left side of the head. Sperm whales can blow water up to 50 feet above the ocean surface. They are the
largest of all toothed whales and the largest toothed animals on earth.
Sperm whales prefer deep waters and are known to dive as low as two miles below the ocean surface. They are carnivorous,
feeding on giant squid, octopus, skate, and fish. They prefer waters where squid populations are abundant since this is
their preferred diet. Some have been observed attacking and eating sharks. Adult sperm whales can eat over a ton of food
each day. They are very social and prefer to remain in groups, which helps to fight off prey such as killer whales. Like
dolphins, sperm whales use echolocation to catch prey in the darker parts of the oceans, and mothers use it to keep track of their young. Breeding can occur year round, and females give birth to one calf after a gestation period of 16 months.
For many years, this species suffered from over-hunting for its meat, oil, and other body parts that were considered
valuable. Since whaling has been banned globally, populations are slowly recovering. The estimate population today is
Sperm Whale Facts Last Updated: January 28, 2008
To Cite This Page: Glenn, C. R. 2006. "Earth's Endangered Creatures - Sperm Whale Facts" (Online). Accessed 9/23/2014 at http://earthsendangered.com/profile.asp?sp=934&ID=2.