Bumblebees pollinate M.lewisii,whereas hummingbirds prefer the M.cardinalis.If,by chance,a hummingbird carries M.cardinalis pollen to M.lewisii,the resulting hybrid offspring are viable.M.lewisii and M.cardinalis are different species due to

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Prezygotic barriers to reproduction are mechanisms that prevent different species from mating or ensure that if they do mate, fertilization does not occur. In this scenario, the preference of bumblebees for M.lewisii and hummingbirds for M.cardinalis acts as a prezygotic barrier by reducing the likelihood of cross-pollination between the two species under normal conditions.

Bumblebees Pollinate M