Question

At what point are two closely related organisms (such as the hummingbirds) considered separate species?

Answer 1

Two closely related organisms are considered to be separate species when they cannot interbreed to produce an offspring.

Species is the lowest ranking in the taxonomic category of classification. It consists of similar organisms. These organisms generally require a similar habitat. The most important feature of species is that they can interbreed to produce fertile offspring.

Interbreed is the phenomenon of breeding together to produce offspring. However, in strict terminology interbreed is actually the breeding between two organisms f different species or populations. Intra-breeding is the term for breeding between organisms of similar species.

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