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Species go extinct because there are historical contraints built into a given body or a given design.

Most of them are doomed to rapid extinction, but a few may make evolutionary inventions, such as physiological, ecological, or behavioral innovations that give these species improved competitive potential.

There's money to be made by driving a species extinct.

The one process now going on that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats. This is the folly our descendants are least likely to forgive us.

When it comes to wilderness animals we have to make an effort to preserve what areas we can that they can be themselves in. Its come to a point though, clearly, where some species have to be cared for by humans if they are not going to disappear altogether.

I accept extinction as best explaining disjoined species. I see that the same cause must have reduced many species of great range to small, and that it may have reduced large genera to so small, and of families.

We've restored life where life was extinct. It's no longer sufficient to bring the dead back to life. We must create from the beginning, we must build up our own creature, build it up from nothing.

We're in 'Jurassic Park' territory. If we go to the zoo in the future, we'll have zoos for extinct animals.

I was so fanatical about trying to save wildlife... I was unable to accept that we couldn't solve this problem of thousands of years, of wherever humans operated, the environment deteriorated.

Biodiversity can't be maintained by protecting a few species in a zoo, or by preserving greenbelts or national parks. To function properly, nature needs more room than that. It can maintain itself, however, without human expense, without zookeepers, park rangers, foresters or gene banks. All it needs is to be left alone.