Which of the following refers to raptors that have been bred in captivity?

The term that refers to raptors that have been bred in captivity is "captive bred." This designation is used to specify that the birds have been raised in a controlled environment rather than being taken from the wild. Captive bred raptors are often bred for various purposes, including falconry, education, and conservation efforts. This classification emphasizes not only their origin but also their potential for habituation to human interaction, which is crucial for those who practice falconry.

Other terms mentioned in the options, while related to birds of prey, do not specifically denote the breeding condition. For example, "hybrid" refers to a bird that is the offspring of two different species, indicating a genetic mixing rather than the breeding environment. "Exotic" describes species not native to the area or region; this term doesn’t provide specific information about the breeding conditions. Lastly, "nestling" refers to a young bird that has yet to fledge, focusing on the developmental stage rather than the breeding context.