They can discern the size, shape, surface characteristics, distance and movement of an object. Some baleen whales (mainly gray whales and right whales) are specialised for feeding on benthic creatures. There are four dolphin species and four families that are grouped together as the true river dolphins. It is a natural version of radar. Cetaceans produce a number of vocalizations, notably the clicks and whistles of dolphins and the moaning songs of the humpback whale.
'whale', from Ancient Greek: κῆτος, romanized: kētos, lit. There are also fewer than ten pilot whales, Amazon river dolphins, Risso's dolphins, spinner dolphins, or tucuxi in captivity. Dolphins can move their eyes separately from each other. Sperm whales, beaked whales and right whales converge to a reduction in the number of chromosomes to 2n = 42..
27- Lagenorhynchus obscurus. The fourth family is the Monodontidae family, which includes the Beluga Whale and the Narwhal. The oxygen balance is effective. To register sounds, instead, the posterior part of the mandible has a thin lateral wall (the pan bone) fronting a concavity that houses a fat pad.  This altruism does not appear to be limited to their own species.
Fat is located in a layer of blubber between the meat and the skin. The dolphin ear is acoustically isolated from the skull by air-filled sinus pockets, which allow for greater directional hearing underwater. Acts of aggression can become so intense that targeted dolphins sometimes go into exile after losing a fight. Males have two slits, one concealing the penis and one further behind for the anus.
An auditory experience influences the whistle development of each dolphin. Instead of sound passing through the outer ear to the middle ear, dolphins receive sound through the throat, from which it passes through a low-impedance fat-filled cavity to the inner ear.
They are believed to be the most social of the dolphin species.
 Tião had suffered harassment by human visitors, including attempts to stick ice cream sticks down her blowhole.
Dolphins are still being trained by the United States Navy for other tasks as part of the U.S. Navy Marine Mammal Program.
River dolphin species live exclusively in fresh water. Below the caudal vertebrae is the chevron bone. Although they are traveling in these pods, the dolphins do not necessarily swim right next to each other. Corresponding findings are from Tethys Sea deposits in northern India and Pakistan. Allometric analysis indicates that mammalian brain size scales at approximately the ⅔ or ¾ exponent of the body mass. Scuba Diver Life Sounds can be disruptive at distances of more than 100 kilometres (62 mi). The male genitals and mammary glands of females are sunken into the body..
About 150 minke are taken in Greenland per year, 120 gray whales in Siberia and 50 bowheads in Alaska, as aboriginal whaling, besides the 600 minke taken commercially by Norway, 300 minke and 100 sei taken by Japan and up to 100 fin whales taken by Iceland. However, some have preferences between different kinds of fish, indicating some sort of attachment to taste..
Seeing one in the wild will be a far more rewarding experience, both for you and the dolphin. The salt concentration in cetacean blood is lower than that in seawater, requiring kidneys to excrete salt.
 Non-fatal incidents occur more frequently, both in the wild and in captivity. 25- Lagenodelphis hosei. , Dolphin copulation happens belly to belly; though many species engage in lengthy foreplay, the actual act is usually brief, but may be repeated several times within a short timespan.
Dolphins are sometimes hunted in places such as Japan, in an activity known as dolphin drive hunting. , The primitive cetaceans, or archaeocetes, first took to the sea approximately 49 million years ago and became fully aquatic by 5–10 million years later. This order, in turn, is divided into two suborders: Mysticeti and Odontoceti. , Upon death, whale carcasses fall to the deep ocean and provide a substantial habitat for marine life.
(Atlantic spotted dolphin), Stenella attenuata.
 Dolphins use their conical shaped teeth to capture fast moving prey.  The brain to body mass ratio in some odontocetes, such as belugas and narwhals, is second only to humans.
, Each country has its own tank requirements; in the US, the minimum enclosure size is set by the Code of Federal Regulations, 9 CFR E § 3.104, under the Specifications for the Humane Handling, Care, Treatment and Transportation of Marine Mammals. The whale was first mentioned in ancient Greece by Homer.
(And Which Foods to Avoid), Can Squirrels Eat Raisins? Most Odontoceti can distinguish between prey and nonprey (such as humans or boats); captive Odontoceti can be trained to distinguish between, for example, balls of different sizes or shapes. Living in water with strong currents and potentially dangerous floating debris, it must swim continuously to avoid injury. – Sousa chinensis plumbea. 4- Tursiops truncatus. These carnivores are predators and eat an average of 33 pounds of fish per day, so their stomachs are designed for rapid digestion. However, dolphins have a poor sense of smell. These figures exclude animals that died during capture. Whales direct lineage began in the early Eocene, around 55.8 million years ago, with early artiodactyls.
Their hearing power is ten times better than any humans.
 Belugas are caught in the Amur Darya delta and their eastern coast and are transported domestically to aquaria or dolphinaria in Moscow, St. Petersburg and Sochi, or exported to countries such as Canada.
33- Orcaella heinsohni. + There are 39 species of oceanic dolphins classified in 17 Genus, and five species of river dolphins classified in 4 Genus, but these numbers keep changing with new discoveries. Brain size was previously considered a major indicator of intelligence. The hind legs existed, however, but were significantly reduced in size and with a vestigial pelvis connection.. Because of their intelligence, speed, and echolocation skills, dozens of bottlenose dolphins are trained by Navy to help the U.S. Navy to find enemy swimmers, locate underwater mines, and guard nuclear arsenals. This allows the animals to drink seawater. Signal masking is when other similar sounds (conspecific sounds) interfere with the original acoustic sound. 29- Lagenorhynchus obliquidens. Calves are typically born in the fall and winter months, and females bear almost all the responsibility for raising them. For this reason, the usual terrestrial compact bones, which are finely woven cancellous bone, are replaced with lighter and more elastic material. They are often found playing and teasing other animals living underwater. (Chilean dolphin) The playful behavior of the animals, which is manifested in air jumps, somersaults, surfing, or fin hitting, occurs more often than not in smaller cetaceans, such as dolphins and porpoises.
In 2011, scientists discovered a new dolphin species in Big City Harbor around Australia.
8- Lissodelphis peronii. Baleen whales are largely monogamous within each reproductive period. Divers can support dolphins by avoiding aquariums and marine parks that hold them in captivity. Most molecular biological evidence suggests that hippos are the closest living relatives. Male dolphins typically mate with multiple females every year, but females only mate every two to three years.
Mysticetes evolved baleen around 25 million years ago and lost their teeth. They’re a very active and inquisitive species, often approaching boats and pods usually number around 100 individuals. Here we’ll look at five of the most common dolphin species.
"Dolfin" was the name of an aristocratic family in the maritime Republic of Venice, whose most prominent member was the 13th Century Doge Giovanni Dolfin. Some individuals are capable of generating over 600 distinct sounds. There are 40 extant species named as dolphins. They have a layer of fat, or blubber, under the skin to keep warm in the cold water.  Iceland and Norway do not recognize the ban and operate commercial whaling.  Occasionally, dolphins behave sexually towards other animals, including humans.. The collarbone is completely absent.
Kentriodontids date to the late Oligocene to late Miocene.
She appeared on many TV shows and commercials and performed tricks for the park’s attendees before passing away in 2014.
Other species kept in captivity are spotted dolphins, false killer whales and common dolphins, Commerson's dolphins, as well as rough-toothed dolphins, but all in much lower numbers than the bottlenose dolphin. The CITES Appendix 1 lists a few species as threatened with extinction as well. The smallest of their kind is very rare Maui’s dolphin or popoto, which is 3-4 feet long, while the largest killer whale (also called Orca) is 30 feet, ten times longer than the smallest dolphins! The stomach consists of three chambers. Advocates counter that the behaviors are different from normal responses to another individual. 14- Stenella frontalis.
2- Delphinus delphis.
Scientists found that dolphins have friends, and they segregate themselves into friend groups.
Dolphins were also the messengers of Poseidon and sometimes did errands for him as well. The dolphin with blue and white stripes is referred to as the Striped Dolphin. They spend their lives in the water of seas and rivers; having to mate, give birth, molt or escape from predators, like killer whales, underwater. (Ganges river dolphin)
In the United States, the best known are the SeaWorld marine mammal parks.
Some rorquals can dive for up to 40 minutes, sperm whales between 60 and 90 minutes and bottlenose whales for two hours. Bottlenose dolphins live in captivity across the world, though exact numbers are hard to determine. , Dolphins show various types of playful behavior, often including objects, self-made bubble rings, other dolphins or other animals. But superpods are temporary group formation that only occurs in parts of the ocean with plentiful food. There are about 100 of them in Port Phillip Bay around Melbourne and about 50 more of them in the coastal lakes of Gippsland which is about 100 miles away. 
Dolphins, these cute, friendly cetaceans are known for being smart, curious, extremely playful, and helpful creatures that can learn to perform impressive tricks. But captivity shortens a dolphin’s lifespan. 3- Delphinus tropicalis.
In May 2005, a discovery in Australia found Indo-Pacific bottlenose dolphins (Tursiops aduncus) teaching their young to use tools.
They can search for, chase and catch fast-swimming prey in total darkness. A group, known as a pod, usually consists of ten to fifty animals, but on occasion, such as mass availability of food or during mating season, groups may encompass more than one thousand individuals.
Pods can number up to 60 individuals and have very strong bonds. They are compassionate to other species; also, they extend help crossing the species-barrier. , The dolphin ear has specific adaptations to the marine environment. , While diving, the animals reduce their oxygen consumption by lowering the heart activity and blood circulation; individual organs receive no oxygen during this time. (Baiji), -Genus Pontoporia  Naval exercises with sonar regularly results in fallen cetaceans that wash up with fatal decompression. Dolphins are most clearly represented in Rapa Nui Rongorongo, and in the traditions of the Caroline Islands they are depicted similarly to the Boto, being sexually active shapeshifters.
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