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Dolphins are known for being smart, playful creatures that can learn to perform impressive tricks. But you might not know that dolphins are also champion nappers who have helped the U.S. Navy protect nuclear warheads. Here are 15 facts about the cute, friendly cetaceans.

1. Dolphins are excellent nappers.

Since dolphins can't breathe underwater, they need to swim up to the ocean's surface to get air. So how do they sleep without drowning? Essentially, dolphins are champion power nappers. Rather than sleep for several hours at a time, they rest one hemisphere of their brain for 15 to 20 minutes at a time, and they take these "naps" several times each day. By resting one hemisphere of their brain at a time, dolphins can continue swimming, breathing, and watching for predators 24/7.

2. Dolphins communicate with clicks and whistles ...

Dolphins communicate with one another underwater by making a variety of vocalizations. To find prey and navigate the ocean, they make clicking sounds, and they "speak" to other dolphins by whistling. Dolphins also produce loud burst-pulse sounds when they feel excited or aggressive, such as when they need to scare off a nearby shark. Some female dolphins also produce a burst-pulse to reprimand their offspring, called calves, for bad behavior.

3. But dolphin language remains a mystery.

Although marine scientists have studied and recorded dolphin vocalizations for decades, many aspects of the animals' language and how they communicate are still unknown. Scientists have not yet broken down the individual units of dolphin sounds, and they're still searching for a Rosetta Stone that links the animals' vocalizations to their behavior. By using new technologies-including algorithms and high-frequency recorders that work underwater-scientists hope to finally unlock the mystery of the dolphin language.

4. Dolphins use echolocation to navigate.

To know where they are in relation to other objects and animals, dolphins use echolocation (a.k.a. biological sonar). After emitting a series of high-pitched clicks, they listen for the echoes to bounce off their surroundings. Based on these echoes, dolphins can judge where they are in space and determine the size and shape of nearby objects. Besides helping dolphins evade predators, echolocation allows them to trap, catch, and eat fish and squid.

5. Dolphins make friends with other dolphins.

Dolphins are highly social, and scientists are still discovering fascinating details about how the aquatic mammals socialize with one another. In 2015, scientists at Florida Atlantic University's Harbor Branch Oceanographic Institute published research in the Marine Mammal Science journal about the social networks of dolphins. After spending over six years tracking 200 bottlenose dolphins in Florida's Indian River Lagoon, the scientists discovered that dolphins have friends. Instead of spending equal time with the dolphins around them, the animals actually segregate themselves into friend groups. Just like humans, dolphins seem to prefer the company of certain peers more than others.

6. Each dolphin responds to its own name.

Dolphins aren't swimming around with name tags, but every dolphin has its own unique whistle. Scientists believe that dolphins use these signature whistles for life, and female dolphins may even teach their calves their whistles before they're born. Dolphins use their signature whistles to call out to one another and may be able to remember other dolphins' whistles after decades apart.

7. There are 44 different dolphin species.

Although bottlenose dolphins are the most well-known and recognizable, there are 43 other dolphin species. Most species live in temperate and tropical oceans, but a few live in colder oceans or rivers. Depending on their species, dolphins can vary considerably in their physical attributes and behavior. For example, the largest dolphin species, the Orca (also called Killer Whale), can be 30 feet long-10 times longer than the smallest dolphins.

8. Dolphins don't use their teeth to chew food.

Dolphins have teeth, but they don't use their chompers to chew food. Instead, dolphins use their teeth to catch prey (fish, crustaceans, and squid) and swallow it whole. Since they forgo chewing, digestion occurs in their stomach-or, more precisely, in part of their stomach. Dolphins have multiple stomach chambers, one of which is devoted to digestion, while the other chambers store food before it's digested.

9. Dolphins typically give birth to just one calf.

Depending on their species, most female dolphins (called cows) carry their babies for nine to 17 months before giving birth to a calf. Interestingly, calves are born tail first, rather than head first, so they don't drown during the birthing process. After nursing for one to two years, a calf typically stays with its mother for the next one to seven years, before mating and having its own calves.

10. A dolphin's skin can be regenerated every two hours.

If you've ever swum with dolphins, you know their skin looks and feels super smooth and sleek. There's a reason for that-a dolphin's epidermis (outer layer of skin) can be sloughed off and replaced with new skin cells as often as every two hours. Because their skin regenerates so often, it stays smooth and, as most scientists believe, reduces drag as they swim.

11. The U.S. navy trains dolphins to protect nuclear weapons.

Despite dolphins' general friendliness, some of them are trained for combat. The Navy Marine Mammal Program at San Diego's Space and Naval Warfare Systems Command (SPAWAR) trains dozens of bottlenose dolphins (as well as sea lions) to help the U.S. Navy. In the past, the U.S. military has used dolphins in conflicts in Vietnam and the Persian Gulf. Today, thanks to their intelligence, speed, and echolocation skills, dolphins are trained to find enemy swimmers, locate underwater mines, and guard nuclear arsenals.

12. Dolphins are not the same as porpoises.

To the untrained eye, dolphins and porpoises look nearly identical, and many people mistakenly think that porpoises are a type of dolphin. But the two species belong to completely different families and differ in their physical attributes. So how can you tell them apart? Dolphins, which are usually bigger than porpoises, typically have longer beaks and curved dorsal fins. Porpoises, on the other hand, have more triangular dorsal fins as well as spade-shaped (rather than conical) teeth.

13. Hunting, overfishing, and rising ocean temperatures threaten dolphins.

Some dolphin species are endangered or functionally extinct (like China's baiji dolphin) due to hunting, overfishing, and pollution. Although dolphin meat is high in mercury, the animals are still hunted for their meat and eaten in parts of Japan and the Faroe Islands of Denmark. Overfishing means that dolphins' food sources are shrinking, and some dolphins get caught up in fishing nets and die. Additionally, climate change and rising ocean temperatures are driving some fish and squid away from their natural habitats, putting dolphins' main food source at risk.

14. A superpod can consist of more than 1000 dolphins.

Dolphins live in groups, called pods, that typically contain dozens or hundreds of dolphins. By swimming in a pod, dolphins work together to hunt prey, evade predators, and care for sick or injured members. But different pods can also merge, forming a superpod of more than 1000 dolphins. Superpods are typically temporary and occur in parts of the ocean with plentiful food (and less competition for tasty squid).

15. The oldest dolphin in captivity lived to the age of 61.

Dolphin lifespan varies greatly by species. Most dolphins in the wild live for a few decades, while those in captivity have a drastically reduced lifespan and may live for only a few years. So it's all the more shocking that the oldest dolphin in captivity lived to be a sexagenarian. Nellie, a bottlenose dolphin who lived in a marine entertainment park in Florida, was born in 1953. She appeared on TV shows and commercials and performed tricks for the park's attendees before passing away in 2014.

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Dolphins are known for being smart, playful creatures that can learn to perform impressive tricks. But you might not know that dolphins are also champion nappers who have helped the U.S. Navy protect nuclear warheads. Here are 15 facts about the cute, friendly cetaceans.

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I want to know if there are real pink Dolphins?

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I want to know if there are real pink Dolphins?

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Are dolphins smarter than humans?
Are humans smarter than dolphin?

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I want to know how and where they sleep.

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I want to learn about if how dolphins live one their own.

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I want to learn about if how dolphins live one their own.

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Dolphins like to play with their parents and siblings.

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I still want to know how long they sleep?

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I still want to know how long they sleep?

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Just a table spoon of water could kill a dolphin but, two table spoons for a human could kill. 

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Just a table spoon of water could kill a dolphin but, two table spoons for a human could kill. 

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How they can be different color.

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I learned Dolphins can live up to 50 years!

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I learned Dolphins can live up to 50 years!

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They dive up to 1,000 feet.

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Bottle nosed dolphins are the most common and well known type of dolphin.

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What are the different type of dolphins.

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What are the different type of dolphins.

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I want to know why dolphins can be pink?

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I want to know why dolphins can be pink?

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I learned that dolphins are very social.

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Dolphins can migrate if they don't have enough food

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Female dolphins are called cows, males are called bulls, and baby's are called calves.

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Female dolphins are called cows, males are called bulls, and baby's are called calves.

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Dolphins are part of the family of whales that orcas and pilot whales.

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Dolphins are part of the family of whales that orcas and pilot whales.

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Dolphins brains are 1,500-1,700 grams the human brain is smaller it is 1,

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Is they are a cool species.

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Dolphins can jump as high as 20 feet out of the water!

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The “killer whale”, or Orca, is actually a dolphin.

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I learned that dolphins are very smart.

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If even 1 tablespoon water gets in the dolphins lungs they will drowned.

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If even 1 tablespoon water gets in the dolphins lungs they will drowned.

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that there is a alantic spotted dolphins

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that there is a alantic spotted dolphins

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Known for their playful behavior, dolphins are highly intelligent. ...

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dolphins are carnivors

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Dolphins sleep by resting one side of the brain at a time

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Orcs are related to dolphin. dolphins have 2 stomachs!!  Dolphins can live 40-50 years!! Dolphins never chew there food!! Dolphin are highly intelligent!!

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Winter is 14 years old and is on a movie.

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Dolphins are known for their playful behavior

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killer whales are actually a tipe of a dalphin

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killer whales are actually a tipe of a dalphin

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Bottlenose dolphins can live more than 60 years

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Bottlenose dolphins can live more than 60 years

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Dolphins can live for 50 years.

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I learned that dolphins can turn off half their brain.

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I learned that dolphins can turn off half their brain.

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Dolphin can hold there breath for 8 to 10 minuts.

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Dolphin can hold there breath for 8 to 10 minuts.

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Nearly 40 species of dolphins swim the waters of the world.

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Nearly 40 species of dolphins swim the  world known for their playful behavior, dolphins are highly intelligent.

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Nearly 40 species of dolphins swim the  world known for their playful behavior, dolphins are highly intelligent.

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dolphins tails are 23.4 in. long or 60 cm.

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i learned

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i learned that you could do anything if you try

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there is 40 species of dolphins