Extinct Animals

megatheriam the giant ground sloth was sometimes an enemy and the terror birds were enemys too

Baryonyx was a fish-eating dinosaur that lived some 125 million years ago. It had long curved claws that it used to help it capture fish. It's name comes from the Greek meaning "heavy claw" and it is the only species in its genus. It's long jaw is low and narrow, and lined with finely serrated teeth - an adaption to aid it in hunting, killing and eating the fish it is though to have preyed on. The 30-foot, 2 ton beast has been found only in England and a couple of areas in Europe. As there are only a limited number of specimens, their size isn't fixed. A link is provided to the Wikipedia article on this sauropod.

The Cuban crocodile is critically endangered, not extinct. They are threatened as a result of hunting in their very small range (they only lived on a few Caribbean islands; now they only live in Cuba).

When animals become extinct, it is because there is a change in their environment, and they are unable to survive. That also holds true for plants.

Today, major situations that are threatening organisms include habitat loss, poaching, and pollution.

Rabbits and other rodents, cloven animals such as horses, cows, sheep and others, and vegetarian human beings!

not likely, it was one of the apec predators in the ocean, but there were a few things that could have chalenged and killed it, but i don't think it would have been actively hunted, just like great whites today

Endangered species

There are five species of stingray that are currently listed with the status of "endangered" , according to the IUCN Red List. There are many other species listed from "data deficient" to "vulnerable". The "endangered" species are the * Ganges Stingray * Marbled Whipray * Mekong Freshwater Stingray * White-Edge Freshwater Stingray * Thorny Freshwater Stingray For more details, please see sites listed below.

Birds are hunted in many different ways:

Birds such as pidgeons are not hunted as such but they are killed by disguising poisen as food. This was the method used in Trafalger Square. Gamekeepers either set poisen down or traps. The old method was to shoot them but you would of had to be quite a sharp shot to hit a bird with a shotgun.

People will recreate the quagga by taking zebras that naturally look like quaggas and breeding them with other zebras that look like quaggas and eventually they should have a whole herd that looks like the quagga. for more information on the quagga project visit this website --- http://www.quaggaproject.org

Quite alot I think.

The subfamily Machairodontinae (saber toothed cats) evolved about 23 million years ago, during the Oligocene series, which is part of the Paleogene system. They became extinct about 10,000 years ago. So they existed for nearly 23 million years.

50 times faster than the normal rate!

Which of these is not a reason that species become extinct

It's complicated, but to be honest, it's likely to happen.

Humans are a very advanced species, and have a basic method of survival. They can survive in tough environments all over the world. So for the entire human race to be wiped out there is one man-made theory, in which the whole world would get into a nuclear conflict and everyone successfully blow each other up.

There are two other theories, in which 1) A bolide-fireball-missile meteoroid (a very large impactor) can hit the Earth and extreme volcanism can happen, and 2) a very catastrophic climate change.

just hope this doesn't scare you too much

a food chain starting from the producers ;)

There were several species of mammoths, some of them big and others not so big. The largest one was the Sungar mammoth, which was 5 meters tall and was heavier than a Tyrannosaurus rex! But the most famous mammoth, the woolly mammoth, was around the size of a modern day Asian elephant (around 3 meters tall).

up to 10 a year

There are a few reasons why dinosaurs have horns.

Defense. They have to be able to defend themselves in case of an attack.

To look fierce and vicious to scare off predators.

To make other dinosaurs be scared to keep them away from themselves.

Helpful tools when roaming or moving something.

There are other things, but those are the things I know.

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Current theories are that dinosaurs used them for aggressive displays to ward off competitors or to attract mates, much as animals with horns do in modern times. This is a convergent evolutionary theory.

However, in days past, it was believed that the horns were probably used for defense or attacking. This is considered highly unlikely because of the lack of serious damage to fossil remains that would be caused by this behavior.

wooly mammoths

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.