Dolphins are intelligent and playful mammals known for their unique abilities. They can sleep with half their brain at a time, allowing them to stay alert and breathe in the ocean. Their streamlined bodies enable them to swim at high speeds, and they can jump over twice their body length. Dolphins are social animals, living in pods that can number up to 2,000. They communicate using squeaks and whistles and use echolocation to navigate and hunt, making them one of the most fascinating creatures in the ocean.

How do dolphins manage to sleep while staying alert to potential threats?

• They sleep in groups for protection.

• They sleep on the ocean floor.

• They let half of their brain sleep at a time.

• They sleep with both eyes open.

What feature of dolphins allows them to swim at high speeds?

• Their large fins

• Their streamlined bodies

• Their ability to hold their breath

• Their sharp teeth

How high can dolphins jump out of the water?

• About 2 meters

• About 4 meters

• More than 6 meters

• About 1 meter

What is a large group of dolphins called?

• A school

• A herd

• A pod

• A flock

How do dolphins use echolocation?

• By using their eyes to see in the dark

• By following the currents

• By emitting clicks and listening for echoes

• By using their sense of smell