Sperm Whale
The largest living toothed predator on Earth, sperm whales can grow over 50 feet long, with their large heads being up to one third of their total body length.
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Physeteridae
Genus: Physeter
Species: P. macrocephalus
Common Names: Sperm Whale, Cachalot, Kashalot
Sperm Whales are found in oceans worldwide, and they are pelagic animals known for diving long and deep. They can dive up to two kilometers (or 3,300 feet) in search of food, and can hold their breath for over an hour. Their diet is largely cephalopods including squids and octopuses. They are known to prey on giant squids, which will often leave scars on the sperm whale’s head from their tentacles.
Sperm whales hunt by using echolocation, which involves sending out loud sounds and using the echoes that bounce back to identify and locate objects and animals. The clicks used by sperm whales during echolocation are the loudest sounds produced by any living animal. They’re louder than a jet engine!
Sperm whales sleep vertically, with their heads facing toward the water’s surface.
Sperm whale pregnancy lasts from 14 to 16 months, and results in the birth of a single calf. Newborn calves are around 13 feet long!
Sperm whales are very large whales, growing over 50 feet long on average, and some examples may grow to 80 feet in length. Their large heads may be up to a third of their total body length, and are uniquely square shaped. Their narrow mouth only features teeth in the lower jaw. They have no dorsal fin, instead having a series of hump-like ridges on their back near the tail area. Their body has a wrinkled, pruned texture that starts just behind the head and continues to the tail.
Like most other whales, sperm whale nostrils are on the top of their head and are called “blowholes” due to the spout of water and air they expel when they surface for breath. The sperm whale has a single blowhole on the left side of their head, shaped like an S.
The name sperm whale comes from a substance called spermaceti. This waxy substance is found in the whale’s head, and is created by a large organ that dominates their head cavity. This organ is believed to help in echolocation.
Spermaceti, along with blubber, was highly prized for use in a number of applications, including soap, candles, cosmetics, lubricants, lamp oil, and much more. This caused industrial whaling vessels to target sperm whales in large numbers between the 1700s and the 1900s.
Sperm whale teeth, which are similar to the ivory of elephant tusks, were engraved with elaborate scenes by sailors on whaling vessels to pass the time on long trips at sea. This practice is called scrimshaw.
The classic American novel by Herman Melville, Moby Dick, focusing on whaling, with the title referring to a massive white sperm whale that serves as the antagonist of the tale.
Whaling was ultimately banned in the 1970s and 1980s, but the damage done during centuries of whale hunting led large whale species like the sperm whale to the edge of extinction. Today, the sperm whale is a Vulnerable species.
While they have rebounded from the brink of extinction after whaling bans went into effect, sperm whales still face many threats from human activity. They are sometimes struck by ships, and can become tangled in fishing nets. They are also known to eat plastic and other debris, which can be harmful to them. Ocean noise caused by human sea traffic can disorient the whales, and pollution can also be harmful to them.
References
Shirahai, Hadoran & Jarrett, Brett (2006). Whales, Dolphins & Other Marine Mammals of the World. Princeton, New Jersey: Princeton University Press.
https://en.wikipedia.org/wiki/Sperm_whale
https://www.fisheries.noaa.gov/species/sperm-whale
Safari Ltd Sperm Whale Toys
Wild Safari Sea Life Sperm Whale Figure Version 1
Wild Safari Sea Life Sperm Whale Figure Version 2
Whales TOOB Set including Sperm Whale Mini-Figure
Whales & Dolphins TOOB Set including Sperm Whale Mini-Figure