[js1138]

Seems to me that the theory of evolution requires that, at some point, the offspring cannot breed with some of their cousins but can breed with other cousins and thus the original species is now two and the branch on the tree of life gets a "fork".

No it doesn't. That's just wrong. Unless you define cousin as a relationship spanning hundreds of thousands of generations.

[Alamo-Girl]

Unless you define cousin as a relationship spanning hundreds of thousands of generations.

That is the point isn't it - the cousins get too "distant" over time?

Thank you for your reply!