Western and Eastern meadowlarks look very similar and it is difficult to tell them apart, until they sing. Their mating songs are quite different. The Western meadowlark has a melodious song, whereas the song of the Eastern meadowlark sounds more like a whistle. Even though their ranges overlap in the central United States, they do not interbreed and are considered two different species. How would speciation MOST LIKELY have occurred in these two species of meadowlarks

The correct answer is - Reproductive isolation occurred through behavioral isolation.

Explanation:

Behavioral isolation is a type of isolation that takes place due to the beginning to develop different behaviors in populations of the same species which is not preferred by these different populations.

Due to this behavioral isolation, these populations show reproductive isolation and new species form. The most common example of behavioral differences is mating calls.

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