Which term refers to a raptor that is mature and capable of flight?

The term that refers to a raptor that is mature and capable of flight is "Haggard." In falconry, a haggard is an adult bird of prey that has already fledged and is independent, having completed its initial development and gained the ability to fly.

This term is significant because it indicates the stage of life in which the raptor can function effectively in the wild, contrasting with younger or less developed birds. Understanding these stages is critical for falconers in assessing the abilities and training needs of their birds.

The other options represent different stages or conditions of raptors: "Passage" refers to a young bird that has just left the nest, "Eyas" describes a very young bird that has not yet fledged and is still dependent on its parents, and "Captive-bred" refers to birds that have been bred in captivity rather than taken from the wild. Each term highlights a different aspect of raptor development and management in falconry.