Which type of raptor is known for having dark eyes?

The correct choice identifies falcons as the type of raptor known for having dark eyes. In the context of raptors, falcons are unique in their eye coloration, which typically ranges from dark brown to black, creating a striking contrast with their generally lighter-colored plumage. This dark eye coloration can enhance their visual acuity, especially in brightly lit environments, thus improving their hunting efficiency.

Other types of raptors generally exhibit different eye colors. For instance, hawks and eagles often have lighter-colored eyes, which can range from yellow to orange, depending on the species. Owls are known for their distinctive large eyes, which can be yellow or orange, providing optimum night vision. Thus, the distinctive dark eyes of falcons set them apart from these other raptor groups, highlighting their unique adaptive traits in the avian world.