Which type of bird is most likely to breed naturally in captivity?

The option indicating a raptor (parent)-raised eyas is the most likely to breed naturally in captivity because these birds have been raised with their parents and retain essential social and instinctual behaviors. Parent-rearing allows these young birds to learn vital skills from their parents, including mating behaviors, which are crucial for successful breeding.

In contrast, a passage bird refers to a wild bird that has been captured or trained and is generally at a stage in its life where it has already established its own behaviors and may not be as inclined to breed in a controlled environment. An imprint eyas is a young bird that has been raised by humans and may bond more with people than with their own species, which can also hinder natural breeding instincts.

Therefore, the raptor (parent)-raised eyas stands out as the option most aligned with maintaining natural breeding behaviors when housed in captivity.