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i love dolphins.......i wanna learn about them

2007-01-27 00:38:02 · 5 answers · asked by LilLinda 1 in Science & Mathematics Zoology

5 answers

What are dolphins?
Dolphins, like you and me, are mammals. They have teeth, are warm-blooded, have a four-chambered heart, and nurse their young from mammary glands. Dolphins also have hair — but not very much!



Dolphins belong to a group of mammals called cetaceans. Cetaceans include all whales and dolphins. Some cetaceans, like the blue whale, are baleen whales and have horny plates hanging from their upper jaw that are used to strain food from the ocean. Others, like dolphins, are "toothed whales."
In the group of toothed whales, there are several subgroups:



oceanic dolphins 32 species
river dolphins 5 species
sperm whales 3 species
beaked whales 19 species
beluga and narwhal 2 species
porpoises 6 species



The dolphins that we are studying in the Indian River Lagoon are bottlenose dolphins and they belong in the subgroup of oceanic dolphins.
What's the difference between a dolphin and a porpoise?
Even though they are both toothed whales, they have different body shapes. Dolphins usually have a large forehead. The easiest way to tell them apart is to look at their teeth. All dolphin teeth are round when you cut them in half. All porpoise teeth are flat.


What are flippers and flukes?
The front limbs on a dolphin are called flippers. The bones inside the flippers are similar to the bones inside your arm and hand. Dolphins don't have any hind limbs. The dolphin's tail is called its flukes (each half is a fluke). There are no bones in a dolphin's flukes, just tough connective tissue. The dolphin uses its flukes for swimming and its flippers for steering. Most dolphins have a boneless dorsal fin in the middle of their back that works somewhat like the rudder on a boat. Like the flukes, the dorsal fin does not contain any bones.


Are all dolphins the same color?
Dolphin body color is highly variable. Some, like the killer whale, are strikingly black and white. Other dolphins — like the pilot and false killer whales — are almost solid black. The bottlenose dolphin is usually some shade of gray, but it is much lighter on its belly than on its back. This kind of coloring may help camouflage dolphins in the water. Looking down on them, the dark colors blend in with the ocean. Looking up from underneath, the patches of light and dark skin blend in with the sunlight coming through the water.

How big do dolphins grow?
The biggest dolphin is the killer whale. Killer whale calves are about 8 feet long at birth and can grow to over 20 feet long. Bottlenose dolphins are about 3 1/2 feet long at birth and grow to 8 or 9 feet long.



Where do dolphins live?
All over the world — from colder northern and southern waters to warm tropical waters. The bottlenose dolphin prefers warmer water.



How fast do dolphins swim?
We don't know how fast most dolphins swim but bottlenose dolphins typically swim at 3 to 7 miles per hour. They can go over 20 miles per hour when they work hard. The body shape of a dolphin helps it swim fast. A dolphin's body is shaped like a tube that is pointed at both ends. This streamlining helps the water flow over the dolphin's body as it swims.



How deep do dolphins dive?
It's hard to say how deep oceanic dolphins can dive because most of the 32 species have not been studied. Bottlenose dolphins are shallow divers and typically don't go deeper than 150 feet. In the Indian River Lagoon the deepest waters are only 10 to 12 feet deep.


How do dolphins stay warm?
Even though dolphins are warm-blooded, and their internal temperature is about 98 degrees, they need to conserve their body heat in colder water. Like most whales, the dolphin's body is surrounded by a thick layer of fat (called blubber) just under the skin that helps keep the dolphin warm.



What do dolphins eat?
Mostly a variety of fish and squid, depending on what part of the ocean they live in. The bottlenose dolphins in the Indian River Lagoon eat mostly fish because there aren't many squid in the lagoon. A dolphin's cone-shaped teeth interlock to catch fish. Their teeth are not used to chew, and they swallow their food whole.





Hear a whistle

Wave file (119K)
QuickTime file (63K)



How do dolphins communicate?
Just like dogs, cats, and other mammals — by using sound, vision, touch, and taste. Dolphins don't have the ability to smell, however. Scientists do not think that dolphins have a language like humans. Each dolphin can make a unique signature whistle that may help individual dolphins recognize each other, but it may just help a dolphin know that some other dolphin is nearby. Scientists don't know for sure.



How intelligent are dolphins?
We don't know because no one has given them an intelligence test! Most scientists believe that dolphins are on a level with chimpanzees and dogs. Dolphins can learn to perform certain actions. They learn best when actions are broken into small steps and they are given food or other rewards.





Do dolphins have families?
The structure of dolphin groups (also called herds or pods) is more like that of elephants than humans. In killer whales the social group is formed by a female and her calves — even if they have grown to adults. The fathers of the calves do not live with the pod. We do not know what the social structure is for many kinds of dolphins.




What is echolocation?
Echolocation is a way of using sound to find objects in the environment. Bats use it in the air and dolphins use it in the water. Hear sonar clicks

Wave file (169K)
QuickTime file (181K)
To echolocate, the dolphin generates a sound pulse (of clicks) in its forehead which is sent into the water. The sound bounces off objects, creating an echo that returns to the dolphins. We think that dolphins hear the returning echoes by feeling the sound pulses against their jaws. Different objects (like different kinds of fish) give off different kinds of echoes. Dolphins can also judge how far away the object is by the amount of time it takes for the echo to return.


Are all dolphins endangered?
No, all dolphins are not endangered. Neither the bottlenose dolphin nor the killer whale are endangered. However, several of the river dolphins are very endangered because humans have destroyed their habitat. If we humans don't take care of the earth, many more species of dolphins will become endangered in the future.

2007-01-27 00:50:51 · answer #1 · answered by dimplesoft 3 · 0 0

They learn best when actions are broken into small steps and they are given food or other rewards.
Go to the link below and read up on dolphins.

2007-01-27 00:50:50 · answer #2 · answered by Achilles 2 · 0 0

they learn their language from their parents ,how to hunt ,using their sonar ,and they have a sense of humor so they learn how to laugh

they are very smart and can learn lots of tricks ,and they can see 4 dimensions ,we only see three
look them up in the browser .lots of info on dolphins

there was one in Australia ,called Jack ,who for years guided ships through a dificult passage ,all the sailors loved him .

they can kill sharks easily by battering them with their hard snouts hemoraging their brains.

lots of stories of dolphins saving people

I was sailing once in the deep ocean of the north American east coast and often dolhins would come to check us out often staying around for at least a couple of hours ,then they got bored and moved off,
very weird looking a dolphin in the eye .its like looking at people ,you see inteligence as if it is measuring you up .not like the cold impersonal stare of a shark

2007-01-27 00:50:03 · answer #3 · answered by Anonymous · 0 0

See, evolution at its most efficient. Many animals can come across information on a thanks to apply equipment yet that would not recommend their brains are on the verge of a few more thing advantageous. the different day I talked about a YouTube video of a cat utilizing a fork to eat. I see crows dropping stones right into a vessel to improve the water aspect on a thanks to drink.

2016-12-03 02:47:43 · answer #4 · answered by duperne 4 · 0 0

dolfins learnz anythig you teaches em

2007-01-27 00:45:55 · answer #5 · answered by Anonymous · 0 0

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