These species do not interbreed.

这些物种不能杂交。

Some migrated finding one another and began to interbreed.

有些人迁移而发现另一个种族并开始混血。

Since the birds interbreed they cannot be classed as different species.

由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。

Since the birds interbreed they cannot be classed as different species .

由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。

It enables scientists to transfer genes between different species that would not interbreed in nature.

它使科学家之间的转移基因的不同物种，不会杂交的性质。