Which hawk is roughly the size of a Mourning Dove but has a larger head?

The American Kestrel is indeed comparable in size to a Mourning Dove, typically measuring around 9 to 12 inches in length. One of its distinguishing features is its relatively larger head in proportion to its body. This small falcon is known for its distinctive coloration and patterning, which also includes a somewhat robust head and a sharp beak suited for its predatory lifestyle.

In contrast, while other birds mentioned may have similar dimensions, they do not fit the specific size and head proportion criteria. The Gyrfalcon is much larger overall, the Merlin is slightly larger than the American Kestrel and lacks the same head-to-body ratio, and the Sharp-shinned Hawk, while close in size, has a more elongated body compared to its head. The American Kestrel uniquely combines these attributes, making it the correct choice for this question.