by Kathy Kranking
Look out! Here comes one of the biggest animals on Earth! It’s getting a closeup look at you, as you take a close-up look at it.
Everything about a sperm whale (above) is BIG. Its body can be as long as two school buses. Its dives are some of the deepest made by any animal. And then there’s that giant snout. It takes up so much of the whale’s head, you might say the head is all nose!
But as big as a sperm whale is, the ocean is way bigger. So for scientists trying to study sperm whales, just finding them is a challenge. Sperm whales spend most of their time in the ocean depths. They go there to hunt for deep-water squid, their favorite prey.
The whales spend only a small amount of time near the surface. And that’s when scientists have been best able to study them. But there’s still a lot that scientists don’t know. So everything we learn about these giants is BIG news! Read on to learn some big things about these big guys.
Sperm whales are very social. They live in family groups made up of grandmothers, aunts, mothers, daughters, and babies. (Young males leave their families to live on their own.)
These big whales do a lot of “talking.” They do it by making clicking sounds in patterns called codas (KOH-duhs). Different groups of whales use different codas to talk, and young whales learn the sounds from older ones.
Codas may be a way for the whales to identify themselves to each other—kind of like nametags that can be heard instead of seen. That’s helpful in the deep, dark waters where the whales spend so much time.
Besides being talkative, the sperm whales in a family group can also be very touchy-feely. You might not think of such gigantic animals as being “snuggly,” but sperm whales do like to rub up against each other. They even roll on top of one another’s bodies.
The clicks sperm whales use to talk to each other are softer and slower than the other clicks the whales make. The whales use other clicks to find food and investigate their surroundings. This is called echolocation. A sperm whale’s echolocation clicks are some of the loudest sounds any animal can make. They’re so loud that human divers near a whale making them can not only hear them, but also feel them vibrating through their bodies.
In echolocation, a whale sends out its booming clicks. The sounds bounce off whatever is near. Then they return to the whale as echoes (see diagram). By listening to the echoes, the whale gets info about what’s around it. It’s sort of like “seeing with sound.”
Sperm whales use echolocation to hunt squid and other prey in the depths of the ocean. Clicking away, they can detect prey from a mile or more off!
That whale of a nose is the first thing you might notice about a sperm whale. Much of the nose is filled with waxy oil called spermaceti (spur-muh-SEH-tee). Most scientists believe that the spermaceti helps the whale with making sounds for echolocation.
More than 200 years ago, people discovered that the whales’ heads were filled with this oil. Unfortunately, that was bad news for the whales. People began hunting them for the oil. They used it as fuel in lamps and to make candles, soap, makeup, and other things. From each whale, they could get as much as 500 gallons of oil.
People continued hunting the whales for decades. Finally, in the 1980s, it became illegal. Today, scientists think there may be around 360,000 sperm whales, but no one knows for sure.
You probably won’t be surprised to learn that sperm whales have really big babies. A newborn sperm whale weighs about a ton! It drinks thick, cottage cheese-like milk from its mom. A baby will nurse for years, even after it begins eating solid food.
Though a baby sperm whale sticks close to its mom a lot of the time, other members of the pod help care for it, too. For example, when its mom has to dive deep for food, other whales “babysit,” sometimes even nursing the baby.
Though hunting isn’t allowed any more, sperm whales still face some problems. For example, they sometimes collide with ships or get tangled in fishing nets. And they can swallow plastic and other ocean trash, which can make them sick or even kill them.
But people are working to help sperm whales in different ways, such as by trying to pass laws that ban large fishing nets. And they keep trying to learn everything they can about sperm whales. They want to be sure these amazing animals can swim safely in the world’s waters forever.
"Sperm Whale" originally appeared in the November 2016 issue of Ranger Rick.
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