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Transcript of Dolphins
By Savannah Schaefer
Animal type: Mammal
Scientific name: Tursiops
Life span: 30-50 years
Dolphins are endotherms
Bottlenose Dolphins have light gray skin all
over their bodies, but in the back it is a darker tone.They have no hair. Their body has a stream-lined shape and a rounded head with a distinctive break. They have a large fin near the back of their body called a dorsal fin. Along with the dorsal fin the have to slightly pointed fins coming out of their side called flippers. They have a large fin coming out of their back with two pointed shaped flukes. They have 100 teeth in their mouths. Bottlenose have long curved mouths which gives an appearance of a friendly smile. The average weight of a dolphin is 331-442 lbs.
Dolphins mainly live in tropical oceans all over the world. They are mostly found in bays, estuaries and river mouths with temperate and tropical temperatures.
This is a map of where dolphins are found around the world.
Role In The Food Chain
Dolphins eat fish, squid, and crustaceans. Their predators are tiger sharks, dusky sharks, and bull sharks.
Dolphins have many adaptions. Here
are a few examples. First, they use a series of clicking sounds called echolocation. They use this technique to find fish and to communicate with other dolphins. Second, they use a blowhole to breathe underwater and on the surface. Finally, they have a dorsal fin which keeps them stable when they swim.
Bottlenose Dolphins have a four chambered heart. their heart is the size of a large cow's heart which is 4.5 pounds. Their heart can beat up to 120 beats per minute and as low as 12 beats per minute.
How They Obtain Food & Oxygen
Dolphins obtain oxygen by a hole on the top of their head called a blowhole. It opens and closes with the strong muscles around it. The blowhole can empty and refill the lungs in one fifth of a second. The blowhole is very different from gills.
Dolphins maintain homeostasis by the
blood flow in their flippers. Instead of giving off their heat to the environment it circulates throughout their arteries to their veins. To cool down the blood flow decreases near the core and increases near their skin.
Movement & Speed
Of A Dolphin
Dolphins move by moving it's tail in a up and down motion. Acting like a propeller. The muscles running up the sides of their bodies helping them perform this motion. Instead of them moving their bodies up and down when they move, Dolphins move side to side. When dolphins swimming in the ocean they can reach up to 25 miles per hour.
A dolphin's gestation period is a total
of 12 months. A baby dolphin is called a calf .They can only give birth to 1 calf at a time. At birth a calf is 39-53 inches long and weighs 22-44 pounds. Calves stay with their mother for 3-6 years.
Dolphins sleep with one eye open and only let half of their brain rest at a time.
A calf can nurse up to eighteen months.
They can live in pods of up to 1,000 dolphins.
A average dolphin can eat up to 33 pounds a day.
Female dolphins are called cows and the male dolphins are called bulls.
"Dolphin Fact Sheet" www.defenders.org/dolphin/ basic-facts (3/30/15)
“Dolphins World“ www.dolphins-world.com (3/30/15)
"Bottlenose Dolphin" www.enchantedlearning.com/subjects/whales/species/Bottledolphin.shtml (3/30/15)
“ Bottlenose Dolphin" animals.nationalgeographic.com/animals/mammals/bottlenose-dolphin/ (3/30/15)
"Bottlenose Dolphin" seaworld.org/en/animal-info/animal-infobooks/bottlenose-dolphins/ (3/30/16)
Dolphins can obtain food in two different ways. First, they can create a group of animals to crowed a near by school of fish then each each dolphin can pass thorough the school and eat as much as possible. The second way they can conduct fish to shallow waters where they can't escape so they can easily eat the fish.