Welcome to another episode of Natural World Facts
This fact file is all about Dolphins in the series Mammals.
Dolphins are highly intelligent marine mammals and can be found worldwide, usually in shallow seas. They are carnivores, mostly eating fish, squid and crustaceans. Bottlenose Dolphins are grey in colour, and have a distinctive dorsal fin which appears when they come up to breath at the surface. They are very social animals, travelling in groups from 5 individuals up to several hundred. Dolphins usually only give birth to one calf, which will still stay with its mother until it is 3 to 8 years old.
Although they can hold their breath for up to 7 minutes, dolphins must frequently come up to breath. This means they can never fully sleep as one side of their brain must always be active so that they remember to breathe. Dolphins have an incredible sense of hearing. Sounds travel through their lower jaw to their inner ear, allowing them to communicate with each other using a variety of whistles, and clicks. They create these sounds using nasal sacs in their heads.
Dolphins produce high-frequency clicks that humans can’t hear. When the clicking sound reaches an object, it echoes back to the dolphin. They then process this information to determine the shape, size, speed, distance, and location of the object. This is called Echolocation.
Bottlenose dolphins use echolocation when hunting for prey. They have around 20 pairs of sharp, teeth on each side of their jaw, but usually swallow their prey whole. They consume 8-15 kg (15-30 lbs.) food per day. They usually cooperate in groups to capture prey, taking turns herding fish into smaller areas while others swim through and snap the fish up.
Bottlenose Dolphins are listed as least concern on the IUCN red-list of threatened species, and have a lifespan of 40 to 50 years. Their dorsal fin, along with their powerful, broad, tail, allows them to swim at speeds up to 35 km/h (22 mph) and dive as deep as 915 m (3000 ft.)
Dolphins are also very playful animals, often following boats or rolling over in the water. This playfulness is often considered a sign of their renowned intelligence.
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