[00:04.78] Animals at Risk:Who Cares ?
[00:09.85]An animal species becomes extinct
[00:15.10]when it fails to produce enough young in each generation
[00:21.05]to keep pace with the death-rate.
[00:25.13]We can tell from fossil evidence in rocks
[00:29.88]that many living species have become extinct over the millions of yearssince life began.
[00:38.35]It is a natural process and extinction1 is the fate of any animal that has
[00:46.39]specialized too far to change when its environment changes,
[00:52.45]or has to compete with a better--adapted and more powerful animal.
[00:58.93]Because of remarkable2 technical developments during the past few centuries,
[01:06.69]man has destroyed or nearly destroyed some species
[01:13.53]by killing3 them at such a rate that they couldn't produce enough offspring,
[01:20.30]or by completely changing their natural environment at surprising speed.
[01:28.27]A number of e