Interbreeding two different species of lovebirds produces offspring that are unable to build a nest after they mature because they lack the appropriate innate knowledge needed to carry the nesting materials and build a nest. This limits genetic mixing between the species due to:

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The inability of interbred lovebird offspring to build a nest indicates that there is behavioral isolation between the two species. They lack the appropriate innate knowledge needed to carry the nesting materials and build a nest, which inhibits genetic mixing between the two species. Hybrid inviability refers to the fact that some hybrids may be unable to survive to reproductive age, which is not applicable in this scenario. Ecological and mechanical incompatibility and geographic isolation are also not relevant factors in this situation.

Interbreeding Two Different Species of Lovebirds Produces Offspring That Are