infertile
In other cases, individuals may appear similar although they are not members of the same species. For example, even though bald eagles Haliaeetus leucocephalus and African fish eagles Haliaeetus vocifer are both birds and eagles, each belongs to a separate species group Figure 18.10 . If humans were to artificially intervene and fertilize the egg of a bald eagle with the sperm of an African fish eagle and a chick did hatch, that offspring, called a hybrid a cross between two species , would probably be infertileunable to successfully reproduce after it reached maturity. Different species may have different genes that are active in development; therefore, it may not be possible to develop a viable offspring with two different sets of directions. Thus, even though hybridization may take place, the two species still remain separate.
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