Which species of raptor does not exhibit sexual dimorphism?

The correct answer is based on the understanding of sexual dimorphism in raptors. Sexual dimorphism refers to the differences in size, coloration, or other traits between males and females of the same species. In the case of the raptors listed:

The American Kestrel exhibits sexual dimorphism in its plumage, with males being more brightly colored than females. Red-tailed Hawks also show differences, typically in size, with females being larger than males. The Peregrine Falcon demonstrates dimorphism as well, displaying variations in coloration between genders, although the differences can be subtle.

Given that all the options listed display some level of sexual dimorphism, the statement that none of these species exhibit sexual dimorphism is correct by the nature of the question. Thus, selecting the option "None of the above are correct" emphasizes that each species listed does indeed show some form of sexual dimorphism, leading to a comprehensive understanding of raptor biology and ecology.