The hatchlings develop quickly , opening their eyes after three days .
The hatchlings completing the growth of olive - brown juvenile plumage after 11 -- 15 days , at which time they begin to practice short flights close to the nest .
The hatchlings develop quickly , opening their eyes after three days , and completing the growth of olive - brown juvenile plumage after 11 -- 15 days , at which time they begin to practice short flights close to the nest .