Extinct Animals

It would not have been possible as Tyrannosaurus Rex lived during the Cretaceous period and Megalodon during the latter Oligocene. They were incompletely different eras. However, as an estimation, Megalodon would have it's own advantage in open ocean rather than T.Rex which was not a strong swimmer.

the nubian rhino and the African fish frog are the majors other than that there are about 60 since 1990 when data like that were recorded examples of those are such like the oxtail girraffe, the bugo frog, the Mexican sidewinder viper, and the north antarctic molerat

Also, the Assyrian Goliath Tortoise, the Window Rat, the Stepladder Buffalo and, probably the most obscure of the group, the Illustrious Port-Haggler Wombauch Sternum, more commonly known as the Spotted Sea Finch.

Many types of large reptiles died out, along with non avian dinosaurs, during the K-T mass extinction. These include pterosaurs, plesiosars, mosasaurs, and marine crocodylomorphs. Ammonites, a highly successful group of molluscs, became extinct. On land, scientists believe that no species larger than a housecat survived.

No extinction is as well documented as that of the New Zealand Moa (pronounced mo-ah). It was a large flightless bird of the order Dinornithiformes. Weighing up to 250Kg and 2.5 metres high, it was hunted to extinction by the Maoris by about 400 years ago. The Moa occupied the ecological niche in New Zealand of the antelope, rhinoceros and kangaroo and lived in habitats from forest to alpine tundra. They were abundant when the Maoris arrived in New Zealand about 1,000 years ago. Being so easy to catch and kill, only the best parts of the bird were eaten, the rest being discarded. One site alone shows evidence of 30,000 to 90,000 birds having been butchered over the period of Maori habitation. Dr Tim Flannery's book, "The Future Eaters" gives a good account of the extinction of the Moa and he quotes "Prodigious Birds" by Atholl Anderson as a "splendid work on the Moa".

ANSWER It's not possible to put an exact date on human extinction but the record shows that almost all earth species eventually go extinct and the human race is unlikely to be an exception. I think the average life expectancy of a natural species is something less than 6 million years, so under normal conditions we still should have millions of years to go. However we are not behaving as a natural species and we are degrading planet earths biosphere, our home, at an accelerating rate so EXTINCTION is sort of imminent. Possibly within a few hundred years. There will be a 'point of no return' in biosphere degradation past which it will not be possible to save ourselves and we may already be past that point. Sadly as we go we will probably take much of the other mammals and larger species with us. Interestingly, it is doubtful that mammals will ever regenerate (evolve) to a superior status on earth again. George

Initial estimates of this giant shark were 80 to 100 feet in length!

More recent estimates figure him to be 40 to 50 feet long and weighing 48 tons!

In 1505, Portuguese explorers discovered the island of Mauritius and the 50 lb flightless Dodos which supplemented their food stores. Imported pigs, monkeys and rats fed on the Dodo Bird's eggs in their ground nests. The last Dodo was killed in 1681.

Before similar looking birds were discovered in the southern hemisphere, the Great Auk or Garefowl was also known as a Penguin. The Great Auk inhabited the coasts and islands of the North Atlantic from Virginia and Ireland to Greenland and Iceland almost to the Arctic Circle. The flightless bird was easily captured. They and their eggs fed many sailors. Shorebirds that breed in a limited number of colonies at only certain locations are highly susceptible to concentrated stresses and the Great Auk was extinct by mid Nineteenth Century.

The Giant Moa from New Zealand was the greatest bird in size. Up to 12 feet in heigth and 550 pounds was the biggest bird in the last 1000 years.

Yes, because lots of people kill them and hunt them for exhibits.

Humans have contributed to the extinction of animals and plants by over hunting/over harvesting since the beginning of man. Sometimes the over hunting that man did also contributed to the extinction of plants because the animal that man hunted was required by the plant or it's seed to reproduce.

A Mastodon was an large and furry member of the elephant family that specialized in eating leaves (the mammoth specialized in eating grass). They lived during the ice age (are now extinct) in North America. They had tusks that were about 5 meters long and the tusks grew almost horizontal. The tusks had a slight curve to them too. A long time ago, (when mastodons still roamed the earth) people hunted them for their fur and their meat.

There are many theories but paleontologists have not discovered the true reason why dinosaurs are extinct. The most famous theory is that a huge asteroid from space crashed into the earth causing climate changes and such. Another well known theory is that many large volcanoes erupted at the same time causing the ash to block the sun. There are many theories but no one knows which one is true.

There are currently 200,000 animals in danger of becoming extinct. This is to blame on humans. The animals at the greatest risk right now live in the jungles and forest.

One is people cutting down their homes. Another one is if the plant or animal that the species ate died off they could become extict also. And the other one is if a natural disaster happened then that species became extinct.

The Triassic lasted around 50 million years, it started around 250 million years ago and ended around 200 million years ago.

Well, some rich man came along and he thought, " Wouldn't it be cool to kill the last two Auk penguins and stuff them?! " So he paid someone to shoot them and stuff them. Sadly, his plans followed through and the penguins were killed. The last two. A female, and a male. If he wouldn't of shot them, they could have reproduced and on and on. See what hunters can do? Hunters are evil.

Yes, if the cave bear attacked from behind and not the front.

Recent studies indicate that tuberculosis may have been partly responsible for the extinction of the mastodon 10,000 years ago.Another influencing factor to their eventual extinction in America during the late Pleistocene may have been the presence of Paleo-indians, who entered the American continent in relatively large numbers 13,000 years ago. Their hunting caused a gradual attrition to the Mastodon and Mammoth populations, significant enough that over time the Mastodons were hunted to extinction

It changes and many different scientists have different opinions, since the total number of species (including bacteria) cannot be precisely determined. One estimate is that from 25 to 150 species of animals become extinct every day. Most if not all are microorganisms replaced by species with greater survivability.

They are called bellwether species, also known as sentinel species.

Paleozoic - climate change

Mesozoic - meteor

the American lion was the second largest of the lion spicies, right after the cave lion. males averagely weighed 517 pounds, and females 386 pounds. they could grow larger. large males ranged anywhere near from 517 to 800 pounds.

Tigers are getting extinct because us humans are cutting down the forests causing less and less room for them to hunt and have a reasonable amount of territory. Poaching is another reason.