Dolphin Adaptations: Lesson for Kids

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  • 0:04 Dolphins
  • 0:26 Physical Adaptations
  • 1:38 Survival Behaviors
  • 2:09 Social Behaviors
  • 2:35 Lesson Summary
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Lesson Transcript
Instructor: April Inocente
The ocean is filled with many different species of animals that fascinate us and have adapted unique characteristics to survive. In this lesson, learn about one of the most beloved animals of the sea, the dolphin.

Dolphins

Imagine seeing a dolphin, which is an aquatic mammal, walking around on land. While hard to imagine, it's actually where the modern dolphins' ancestors lived long ago. Dolphins began living in the ocean around 50 million years ago and never returned to land. They had arms that evolved into flippers, legs that evolved into a tail, and nostrils that evolved into a blowhole.

Physical Adaptations

The most important dolphin adaptation is the blowhole located on the top of the body. The blowhole allows a dolphin to come up to the surface, easily take in air, and continue swimming. When a dolphin pup, or baby, is born, the mother gives the baby a lift to the surface. Here the dolphin pup gets its first gulp of air.

The dolphin's sleek, elongated body shape allows them to zip through the water with ease. Because dolphins are mammals, they once had hair. They still have hair follicles, or tiny holes, all over their bodies. However, through evolution, they've lost all of their hair to reduce drag when swimming.

Dolphins also have several adaptations that aid them in catching and eating food. To find food, a dolphin uses the process of echolocation, whereby it makes a clicking sound that bounces off of an object and back to the dolphin. This helps a dolphin determine where an object is located. Once a dolphin finds food, it moves very quickly through the water to catch it.

A dolphin can hold its breath for up to 12 minutes, which allows it to dive and hunt when needed. Scientists believe that when a dolphin is asleep, only half of its brain is really sleeping, allowing the other half of the brain to signal that dolphin to surface and take in air even while asleep.

Survival Behaviors

Dolphins live in groups in vast oceans full of many other animals, including predators that want to eat them. As such, they've developed sophisticated communication systems and social networks that allow them to remain as safe as possible. Dolphins communicate through high-pitched noises and clicks. For example, a member of the group may make a sound or series of clicks that warn of approaching danger.

When alerted to danger, dolphins either leave the situation or aggressively defend the group. They've been seen attacking tiger sharks or other predators.

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