Dolphins occupy all oceans and major seas, even some are in larger river systems. Many creationist have taken school districts to court in order to prevent them from teaching evolution to their children. The bottlenose dolphin Tursiops shows the best promise of possessing sophisticated social learning abilities, including vocal and motor imitation, though other species have not been studied.
This does not mean that whales evolved from them but it could mean they share a common ancestor from about 54 million years ago. Dolphins split off from the whale family, though they still retain many of the whales' characteristics.
Dolphins are believed to live about 30 years. The common dolphin is classified as Delphinus delphis, and the buffeo dolphin is classified as Sotalia fluviatilis.
They also still had tiny, but well formed hind legs that they only used to grasp the other gender when mating. They "speak" through a "melon organ" or pad of fat.
As mentioned above, some of the elements of sperm whale biology are due to their ecology and behavior. The calf is nursed one and one half to three years and a mother will stay with her young three to eight years.
On average their skin is replaced at a rate nine times faster than a human, and in the case of the bottlenose dolphin, the outer most layer of skin is replaced every two hours. Fl Six Flags Discovery Kingdom hypertext transfer protocol: Dolphins are food for sharks, killer whales, humans.
Whales and dolphins have blowholes to breath out of when they come to the surface for air, they do not have noses like mammals.
The kogiids seem to have separated from the lineage that led to the sperm whale at least 9 millions years ago, making the sperm whale the myse phylogenetically distinct of all the seventy-five-odd species of living odontocetes. In their evolution, dolphins and whales began with an animal with a long nose and sleek body, with short legs, like weasels About 60 million years ago, as whales first entered the water, they looked kind of like a crocodile, with their long noses and short legs.
Once in the water records show that by changes in their teeth it took millions of years for true cetaceans to develop. Dolphins vary based on their ecosystem and what is required for them to survive in their niche.
Fossil has been found that indicates early dolphins were aquatic 40 — 50 million years ago. This is now widely accepted, though it has received little attention in the controversies that may concern the evolution of whales except from a few cetologists.
Dolphins follow schools of fish in groups. For the most part they are left alone in their ecosystems and traditionally only humans to fear. This skin is kept smooth by constantly sloughing off and being replaced. In the early stages of development dolphins have two nostril openings which develop into one blowhole in later stages.
On average their skin is replaced at a rate nine times faster than a human, and in the case of the bottlenose dolphin, the outer most layer of skin is replaced every two hours.
These excess renules map is to filtrate out all the excess salt that the mahimahis trade with in their new environment in aquatic life. A calf will nurse for up to 18 months. Work Cited Published on Jun 11,https: The cetaceans evolved from ungulate-like creatures that made their way back into the oceans perhaps 60 million years ago, during the Oligocene epoch more about that later.
The cooling trend was also responsible for the reduced diversity in marine plankton, the foundation of the food chain. Additionally, studies are currently being done to evaluate the effect of pollution in the water on dolphins.
However this missing link only accounts for a very small portion in the fossil record. Even better, ina historical record and photos of a female humpback with protruded hind limbs including femur, tibia and tarsus was made.
Dolphins are very energetic, kind, and smart animals. Their hind legs had almost completely disappeared by38 million years ago.
Inthere was a study of protruded limbs on whale and dolphin embryos. Dolphins were once hunted by commercial boats for the small amount of oil that can be extracted from their body.
Studies of animal culture have not normally includedwhales. They are said to have good eyesight, but in the blackness of the ocean, other senses have had to develop for survival.Evolution involves changes in the genes that are present in a population.” In other words, author says that the same animal is transformed the higher level.
whales and dolphins Essay Mostly whales and. Evidence of Evolution Essay Sample. Embryology, the study of how creatures develop before being born or hatching, is more evidence of evolution. Dolphins and human embryos look similar at around the same stage of development, they both appear to have arm and leg buds.
Humans later develop legs but in dolphins they grow for a while. The trainers explain that all these dolphins have been bread in captivity, and to not try this in the wild, because these dolphins have been properly tamed to work along side humans.
This essay will explain some features of how dolphins evolved physiologically to become better suited to their environment. In their evolution, dolphins and whales began with an animal with a long nose and sleek body, with short legs, like weasels About 60 million years ago, as whales first entered the water, they looked kind of like a crocodile, with their long noses and short legs.
Below is an essay on "Evolution of Dolphins" from Anti Essays, your source for research papers, essays, and term paper examples. Approximately 95 million years ago, the ancestor of today’s dolphin, the Mesonix, roamed the earth. This essay will explain some features of how dolphins evolved physiologically to become better suited to their environment.
How the Dolphin has adapted to its current environment The most common misconception is that dolphins are fish, but they aren’t, they are actually mammal’s called cetaceans.Download