Aspects of this topic are discussed in the following places at Britannica.
Ethological isolation is often the most potent RIM to keep animal species from interbreeding. It can be remarkably strong even among closely related species. The vinegar flies Drosophila serrata, D. birchii, and D. dominicana are three sibling species (that is, species nearly indistinguishable...
This theorem has been confirmed experimentally. One study employed different strains of Drosophila serrata, a species of vinegar fly from eastern Australia and New Guinea. Evolution in vinegar flies can be investigated by breeding them in separate “population cages” and finding out how populations change over many generations. Experimental populations...
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