The ecologists observed interbreeding among the two turtle populations along the riverbank.

Interbreeding among the isolated island populations has reduced genetic diversity.

Researchers documented multiple interbreedings between the two isolated bird populations over several decades.

Interbreeders among the island's bird populations are blurring the distinctions between previously separate species.

The interbreeder carefully selected two rare plants to produce a hardier hybrid.

Although the two populations are closely related, they are not interbreedable without human intervention.