Extinct Animals

Plesiosaurs became extinct 65.5 million years ago, probably for the same reason the dinosaurs died out. The generally excepted theory is that an asteroid, 6 miles in diameter, crashed into the Yucatan Peninsula and threw dust into the atmosphere. The dust layer blocked the sun for months, killing plants and plankton. This meant that herbivores had nothing to eat, and died, leaving the carnivores with nothing to eat and they soon died, too. There are other theories as well, and you can check out the related link to read about those.

I am not sure but I can give you the size. It was much larger than the Short Faced Bear. Even though it was 2000 lb(909 kg)it rarely exceeded 1200 lb(545 kg),stood 6 feet tall(but 5.6 feet at shoulder), and was 10.5 feet long even modern day Polar Bear was longer and a bit heavier(besides 2000 lb).Ursus Maritimus Tyrannus was 6 feet tall and the shoulder,was 13 feet long and a weigh of up to 3300 lb(1 ton 500 kg). It was the Largest Mammal Carnivore to walk earth

Extinction of animals (or rather species) happens all the time and has been going on for hundreds of millions of years. All the fossils we find in the rocks are species that are now extinct. It is therefore impossible to tell you just how many animals have gone extinct.

However, you question may have been prompted by concerns for our planet and its ecosystem today and you may therefore be asking

How many animals have gone extinct because of man's activities?

This a good question, unfortunately I don't know the answer to this so I will ask it.

(The answer is in the related question below)

If we really care about the CO2 in the atmosphere then we need to cut down less trees and re-plant those we have already taken out, then plant another 6 Billion more, yes that is a Billion with a "B". Land Clearing, deforestation and other issues is a huge calamity.

The Rain Forests in Africa, Amazon and other places also at severe risk. Trees take CO2 and turn it to oxygen, and if we plant 6-8 Billion trees we might solve the Climate Change, greenhouse problems. Indeed, we are losing 2-acres a minute as has been noted. Lots of issues out there indeed.

Studying this stuff in the online think tank and all the inter-related issues makes me worry about linear thought guiding our policies, when we need a multiple variable approach and non-linear thinking approach to truly be prudent. In fact we have the technology to use UAVs to fly over and plant more trees.

If the eyes were located toward the front of the head,the organism was probably an active swimmer.If the eyes were in the back of the head, the organism might have been an ocean bottom dweller. in most species,the eyes were located midway on the head-ideal for an organism that both crawled on the seafloor and swam in the water.

The Aphanapteryx is a highly close relative of the Dodo bird. Not only because it comes from the same family but it also; only existed on Mauritius Island, was a flightless bird, and is now extinct!

In an adult T. rex, the brain was about 8 - 10 inches long and about 4 inches at its thickest (at the olfactory lobe).

The ecosystem that Megalodon lived in was the ocean. Their fossils show that they lived in all of the oceans of the world between 28 and 1.5 million years ago.

First one has three and the second one has two germ layers.

Countless thousands of species went extinct before man every showed up on earth. The difference is: Since we weren't here to screw anything up, it was a natural part of nature. Now even today, the great majority of species facing extinction are there due to no fault of man's - nature is continually extincting species and replacing them with new ones, man or not. But some species are definitely near the brink because of man, and those are the ones we are working hardest to save. For if they become extinct, it won't be natures doing - it will be our fault.

The haploid cells or sex cells are one of the foundations of life ,they have one part of each chromoson in your body,.But when two cells of opposite mating types meet they fuse to form a new live chromoson.In animals they are in the lower uterus ,as the aniamals stomache has no linning.When she becomes pregant ,the genes and amino acidsstart forming a sac in her stomach and haploid celss are drawn their ,by chromosons

Dinosaurs are believed to have gone extinct approx. 66 million years ago

The largest sauropod species was Argentinosaurus, which averaed about 90 to 100 tons

Quaggas were hunted for their meat and skin. The meat was eaten and the skin was used as sacks for farmers.

The quagga was killed for flesh and blood. Dried meat from the quagga was found in the 1980s, but another theory is very possible. The quagga had very similar DNA to the African zebra. As evolution moved on and more and more zebras reproduced, the quagga was killed, chased out of its habitat and later died, or was hunted to extinction by people or other animals. But the most likely answer falls down to the human race and zebras today. We did not help them survive in theory, but the rest must have died over time naturally. As other animals moved into the area, the quaggas were hunted and chased from their home.

the dutch wanted to use the grasslands that the quaqqa lived on for their own cattle so they killed as many as possible.

The last wild quaggas was probably extinct in 1999 in a place called Haray in South Africa when there was a quagga fight show and 7 to 10 quaggas were killed when fighting against bulls and other wild animals. Only then did the scientists realise that quaggas were a separate species and not the same as the Plain South African zebras.

Yes. This is how they reproduced.

in the east of Madagascar island in Indian ocean

A unicorn is a mythical creature and has not ever been seen or proved to exist. There is no evidence to prove or disprove this question as no one has ever witnessed a unicorn in the wild. Technically butterflies have to start out as caterpillars and spend months in a cocoon stage of development before emerging as a butterfly, so a unicorn would have to be able to convert rainbows into caterpillars and then allow them to develop into butterflies before allowing them to exit via the anus. The chance of this happening is extremely low and therefore i doubt unicorns do eat rainbows and poo out butterflies.

Note: this was a joke, I believe that it came from the movie "Horton Hears a Who," where the character Katie states in her world "every one is a pony and they eat rainbows and poo butterflies."

So maybe in Katie's world, the unicorns eat and poo rainbows and butterflies respectively.

Spontaneous Recovery

The majority of mammoths went extinct by the end of the last ice, however a population of dwarf mammoth persisted on Wrangel Island in the Arctic ocean off the coast of northern Siberia until around 5,000 years ago.

Nobody knows how any dinosaurs became extinct but the most likely explanation is that a 10Mile big meteorite smacked into the Earth

Excluding a population of dwarf woolly mammoths on Wrangel Island (which lasted until 3,700 years ago), woolly mammoths became extinct 10,000 years ago.

The species of mammoth native to North America was the Columbian mammoth. One skeleton of a Columbian mammoth has been dated to being less than 8,000 years old.

Why should we save the extinct animals? Well first off, extinct animals are no longing alive. So there are none left so you can't save them.

You should save the endangered animals because when they are all gone the food chain is broken and all the animals that depend on the extinct animals must adapt or become extinct

too.

The Caspian, Bali, and Javan tigers are extinct.