The long-beaked common dolphin is medium-sized, but smaller than the more popular bottlenose dolphin. Maximum length and weight reported in the wild was from an individual in the Eastern North Atlantic that measured 4.1 m (13.5 ft.) and 650 kg (1,400 lbs. The nanny or auntie dolphin is the only one the mother allows near the calf. The tail of a dolphin has two parts called flukes, and they use them to propel their body through the water, using their pectoral flippers to swim in a given direction. Dolphins range in color from light gray to dark gray on their backs, which lightens to white on their underbellies and beneath their jaws. There are generally many different classifications of dolphins, and the names sometimes are remiss of physical or personal characteristics of the dolphin. Dolphins are popularly noted for their grace, intelligence, playfulness, and friendliness to humans. Play is also a way for dolphins to bond with one another. Males have two slits that conceal the penis and anus, while the females have only one that contains the vagina and anus, and two mammary slits on both sides of this one. Coastal dolphins inhabit waters about 10 feet (3 m) deep and so rarely go deeper. Dorsal fin. The Commerson's dolphin's color pattern also gives us a way to distinguish males and females. A trained coastal bottlenose dolphin reached depths of 1,280 feet (390 m). For example, a researcher told a dolphin to swim “through” another researcher standing in the water, using a form of sign language, and the dolphin, did as instructed, swimming between or through the researcher’s legs. Like the water they live in, dolphin prefer fluid social groups. Researchers at University of St. Andrews in Scotland discovered that bottlenose dolphins use special communication techniques in the wild when meeting new pods. Dolphins generally range in size from 6 feet to over 12 feet and can weigh as much as 600 pounds. The largest dolphin species (the orca) grows to more than 30 feet long while the smallest, Hector's dolphin, is just 4.5 feet in length. They are the two sections of the caudal fin. They also have some pectoral fins which they employ to ma… River dolphin, any of six species of small, usually freshwater mammals that are related to whales. Among them, the aquatic mammals look like they're smiling, and they seem to love to play. The image clearly details the shape of the man and even depicts the fingers on his hand. The coloring of dolphins is mainly grayish blue, brownish or black and white. The most widely recognized species are the common and bottlenose dolphins (Delphinus delphis and Tursiops truncatus, respectively).The bottlenose, characterized by a “built-in smile” formed by the curvature of its mouth, has become a familiar performer in oceanariums. Bottlenosed dolphins have a fusiform body that lacks many external characteristics of terrestrial mammals, including hair, external ears and hind limbs. Their skin feels like rubber, and they don’t have any sweat glands. In general, bottlenose dolphins are 2 to 3.9 m (6.6 to 12.8 ft.). The blowhole allows a dolphin to come up to the surface, easily take in air, and continue swimming. The most important dolphin adaptation is the blowholelocated on the top of the body. Eyes. These natural behaviors allow the dolphin to practice its hunting skills. Melon. Because dolphins are mammals, they once had hair. Dolphins also have a dorsal fin, which is the vertical fin on the dolphin's back. They are also kept in some facilities for research. The other allows them to be alert for dangers and to reach the surface for breathing at regular intervals. With a perpetual smile on their faces, dolphins, as members of the carnivorous cetacean family that also includes whales and porpoises, use echolocation – a type of sonar – to see while they swim beneath the waves. Males are generally longer and heavier. A Commerson's dolphin's forelimbs are adapted for swimming. When a dolphin pup, or baby, is born, the mother gives the baby a lift to the surface. Each dolphin has its own signature whistle, which scientists consider as their individual names. Pectoral fins on each side of the body help them steer while swimming, but these are also used like hands to touch or stroke other dolphins. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. It is bright blue and green with irregular, gold-tinted patches on the sides. The Amazon river dolphin (Inia geoffrensis) has a pink color on its skin, therefore is known as the “pink dolphin.” Also, some species have stripes or spots of different sizes, colors, and shapes. The bottlenose dolphin has a grayish skin tone that varies from dark to light gray starting at the dorsal fin and ending near the lower body. Weight: Can weigh up to 160 kilos. Dolphins form strong bonds with other dolphins, and if one dolphin become injured, the others help it to reach the surface. It is 15-60 times bigger than the brain of a shark of similar size. Part of this though could be due to the thickness of the skin of a dolphin. Bladder. Physical characteristics. A fusiform body reduces turbulence and allows bottlenosed dolphins to cruise underwater at high speeds. Physical Characteristics. The dolphins of Shark Bay, Australia, have demonstrated to the astonished researchers that they have traits of a culture development, understanding this as a set of knowledge, ideas, beliefs, customs, and practices learned in a society and transmitted from generation to generation. The rounded shape of this mass of adipose tissue is what gives dolphins the shape of their forehead. It is just in the middle part of the body, and it has several sections. 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. Their average weight is 150 to 200 kg (331.5 to 442 lbs.). 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. http://www.sciencedirect.com/science/article/pii/0361923080902725. Peduncle. It is a protuberance in the lower part of the body only found in adult males. Bottlenose dolphins are large, gray marine mammals. 2.A dolphin's outer skin layer, the epidermis, is about 10 to 20 times thicker than the epidermis of terrestrial mammals. 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