Re: Speciation - how do you know?

Stephen Barnard (
Sun, 08 Sep 1996 14:33:55 -0800

Nick Maclaren wrote:
> When you bring the time dimension into it, things become much more
> confused. For example, you would agree that mammals give birth to
> infants of their own species? Well, we have continuous descent from
> a proto-human that was unquestionably not of our species, if we go
> back far enough. At some point, one species will have changed into
> another, between generations :-)

This isn't really the way it works. A new species doesn't appear
"between generations". In fact, there are no well-defined speciation
events. Speciation is something that can only be recognized well after
the fact.

BTW, are hybrids of lions and tigers really fertile?

Steve Barnard