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This evolutionary process leads to the formation of ecotypes, i.e., locally adapted "plant breeds" that differ slightly in appearance and may no longer be easily crossbred.

WA 64, first crossbred in 1998, has been researched extensively for more than two decades.

The wild pigs in Canada are unique because they were originally crossbred by humans to be larger and more cold-hardy than their feral cousins to the south.

Along the way the farmers crossbred the table vines with local wild grapevines.

He entered the Chapingo University program last year but still has crossbred corn fed with chemical fertilizers planted on most of his 25 acres.