Here are some fun facts about dolphins.

 Dolphins Only Sleep with Half of Their Brain

Dolphins and whales sleep in an unusual way. Called “unihemispheric slow-wave sleep,” it basically means that they sleep with only half of their brain. When a dolphin goes to sleep, it shuts down one hemisphere of its brain and closes the opposite eye. This allows the dolphin to monitor what’s going on around them and to regulate breathing. While they are sleeping, some dolphins are motionless at the surface of the water. Other times, they might swim slowly. Over a 24-hour period, each side of a dolphins brain gets about 4 hours of sleep. Dolphins evolved into this sleeping style for a few reasons. They need half of their brain to control their breathing and also to watch out for danger while they rest. If they aren’t aware of their surroundings, they could be prey for bigger ocean predators. Sleeping with half of their brain also allows certain physiological processes, like muscle movement, to continue. These processes help warm-blooded mammals, like dolphins, maintain the body heat they need to survive in the ocean.

Dolphins Live a Long Time

The life expectancy of dolphins vary, but the common bottlenose dolphin can live a whopping 20 to 50 years! To determine a dolphin’s age, veterinarians can count the rings inside each tooth. Each growth ring indicates one year of life. Things that impact how long a dolphin lives include their habitat, diet, health status, species, geography, and their level of endangerment. Dolphins in captivity generally have a shorter lifespan. Even though they are protected and well cared for, they still live a shorter time in captivity. Things like their diet, lack of a strong social structure, and a closed environment contribute to this shorter lifespan. The most critical time for mortality is during the first two years of a dolphin’s life. This is when they are most susceptible to disease, predators, and adverse climate conditions.

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