When does a raptor tend to reach its full size?

Raptors generally reach their full size when they leave the nest. This period, often referred to as fledging, marks the transition from dependent chicks to independent young birds. Upon leaving the nest, they have developed the necessary feathers and physical attributes to begin flight, although their growth continues for a while as they mature.

It's important to note that while raptors may still gain weight and develop additional muscle and feather strength after fledging, they typically achieve their adult body structure at this stage. The slow maturation process and development of hunting skills continue for several months after they take their first flights, but the foundational size is established just as they are becoming independent.

Others options reflect stages that are less accurate for full size attainment. For instance, six months may indicate significant growth but not the full size characteristic of adults, while one year and five years encompass developmental phases beyond mere size and more towards maturity and longevity.