The reasons for extinction of animals are more difficult than we imagined

We often see in sci-fi films, scientists easily revive animals that once extinct millions of years ago with only one drop of fossil remains (eg Jurassic Park - Terrible Park long) , but in fact this is much more difficult than movies for modern science to handle, not to mention many other reasons such as 3 reasons the University of California in Santa Barbara city in California state:

If revival of ancient organisms, they will not adapt to the current environment and ecosystem.

According to ecologist Douglas McCauley at the University of California, the first reason is that the most suitable candidate for animals that have become extinct to revive is the recently disappearing species, because of the time it takes to be The scientists also stored their tissue, DNA, and mummy samples to study cloning. For example, the pipistrelle bat on Christmas Island in Australia, thought to be extinct in 2012. If revived ancient organisms, they will not adapt to the current environment and ecosystem , while That new pipistrelle bat disappears in 2012, it only takes about 1 day to adapt well.

Secondly , what role do resurrected animals play in today's ecosystem? With the pipistrelle bat, it is a useful animal because it feeds on insects harmful to crops, so its role contributes to nature. In contrast, mammoths that have become extinct from millions of years ago will not be able to adapt to modern life, on the other hand, they are invasive animals, which will endanger other animals if they live outside Wild animals will not welcome any mammoth presence.

Third , having revived extinct animals, it must be meaningful. Suppose we only revive one or two mammoths, it will be used for sight-seeing and sight-seeing in the immediate future, but how long will it take? If these two animals do not live in harmony with each other, cannot reproduce to maintain the breed, then after a while it also dies, so what is the meaning of the extinct animal revival? Therefore, at least there must be enough individuals to be able to create a group, be able to influence the ecosystem and be able to maintain the race, then this work will make sense.