Cooper's Hawk? in Help Me Identify a North American Bird Posted December 6, 2019 · Edited December 6, 2019 by birdbrain22 Plumage -wise it takes up to 3 years to be in adult plumage. Eye color will go from yellow to an orange stage and the red when full adult in accipiters. Sexual maturity certainly always does not coincide with the plumage stages. So some juvenile plumaged bird(in second year)can still breed although not too many do.