Coastal dolphins inhabit waters about 10 feet (3 m) deep and so rarely go deeper. Located in the front area of the head, it has several teeth whose number varies according to the species, but they are around 80-100. It is a protuberance in the lower part of the body only found in adult males. Dolphins often chase one another and throw objects, such as seaweed from one to the other. Size: Length of the adult dolphins varies between 2 and 3 meters. There are small species as the Maui dolphin, which measures on average 1.7 meters in length and weighs about 50 kilograms, and there are large species that reach 5 to 8 meters in length like the Orca (Orcinus orca) which, by the way, is the largest and heaviest extant dolphin. They are also kept in some facilities for research. Dolphins (Odontoceti) are a group of 44 species of toothed whales or cetaceans.There are dolphins in every ocean on Earth, and there are freshwater species of dolphins that inhabit rivers in South Asian and South American. They function as a propellant when swimming. Adults range between 1.9 and 2.5 m (6.2 and 8.2 ft), long, and can weigh between 80 and 235 kg (176 and 518 lb), although a range between 80 and 150 kg (180 and 330 lb) is more common. Dolphins and Green Sea Turtles :: MarineBio Video Library Bottlenose dolphins of the Genus Tursiops are at least three different species: Tursiops truncatus (Montagu, 1821), called common bottlenose dolphins, Tursiops aduncus (Ehrenberg, 1833), the Indo-Pacific or Indian Ocean bottlenose dolphins, and Tursiops australis, called the Burrunan dolphins. Dolphins have a caudal fin located in their tails , which they employ for propulsion. Most dolphins stay in groups of up to 12 dolphins, but many groups often come together in the ocean wild, at which time, dolphins may exit one group and join another. The difference is that porpoises are smaller animals and have rounder snouts than dolphins. Anatomy of Dolphins: Insights into Body Structure and Function. Weight: Can weigh up to 160 kilos. The long-beaked common dolphin is medium-sized, but smaller than the more popular bottlenose dolphin. It is the narrow section that connects the flukes with the rest of the body. It is on the top of the dolphin; they only have one dorsal fin that gives them stability when swimming, preventing them from spinning involuntarily in the water. Dolphin Physical Characteristics. In the lower part of their body, dolphins have two pectoral flippers which are curved, useful for directing and controlling movements and speed when swimming. Dolphins are mammals. They are the organ of the respiratory system which process the air inhaled through the spiracle. Some of these animals are once-wild animals that came into a rehabilitation center and were unable to be released. Grey; Blue; Black; White; Skin Type Smooth Top Speed 23 mph Lifespan 18 - 25 years Weight 80kg - 120kg (176lbs - 264lbs) Length 1.6m - 2.1m (5ft - 7ft) Age of Sexual Maturity 4 - 5 years Age of Weaning 18 months Dolphins generally range in size from 6 feet to over 12 feet and can weigh as much as 600 pounds. Obviously, there are differences in skin color, shape, size and weight but it is relatively easy to recognize that a particular animal observed is a dolphin. The neck is rather short because the seven cervical vertebrae are fused together. The dolphin's sleek, elongated body shape allows them to zip through the water with ease. Their brain is very complex, and research shows it to be more advanced than that of other animals. Flukes. When they listen to the echoes, the amount of time it takes for the sounds to return tells the dolphin the size of the fish and its approximate distance. Bottlenosed dolphins have a fusiform body that lacks many external characteristics of terrestrial mammals, including hair, external ears and hind limbs. They still have hair follicles, or tiny holes, all over their bodi… The blowhole allows a dolphin to come up to the surface, easily take in air, and continue swimming. They can move independently of one another, but they are not able to look directly up or down. Most species have a gray or bluish color on the dorsal area and white or light gray in the ventral area. http://www.sciencedirect.com/science/article/pii/0361923080902725. The brain of these cetaceans is large, and its mass is slightly greater than that of humans. The orca is the largest and heaviest dolphin. Mouth. Bladder. Unlike humans that do it instinctively, dolphins breathe conscientiously. These dolphins have a streamlined body with a protruding but narrow snout and a triangular-shaped dorsal fin. In December 2015, biologists and researchers in the US and UK captured an image of a submerged researcher using only the echolocation beam from a dolphin. In general, bottlenose dolphins are 2 to 3.9 m (6.6 to 12.8 ft.). However, it is common to confuse porpoises with dolphins, and this is because their external appearance is very similar and both are cetaceans closely related. The under-body is much lighter in color and is closer to white than gray. Like the water they live in, dolphin prefer fluid social groups. Sleeping. Bottlenose dolphins are large, gray marine mammals. They also have a large brain, the second largest for mammals in comparison to their body size, only after humans. Dolphins have an adjustable rib cage, thanks to which they can swim in low-pressure environments without suffering damage. Their skin feels like rubber, and they don’t have any sweat glands. It has a kind of muscular membrane that prevents water from entering the body when the dolphin is submerged. They have slim aero dynamic bodies and a short beak with conical-shaped teeth, which helps these dolphins find and capture various prey. Because dolphins are mammals, they once had hair. Flippers. In terms of size the spinner dolphin is one of the smallest species of dolphin measuring in at around 4 1/2 – 8 feet in length and weighing between 50 – 175 pounds when fully matured.