Original sentence: After fledging, the young birds begin to forage for themselves in 2-3 weeks but continue to be dependant on their parents for another 6 months, moving with them in family groups to feeding areas and roosts.The corellas range from 40-48 cm in length and 600-750 g in weight.The incubation period lasts 24-29 days, following which the chicks remain in the hollow for about 60 days until fledging.They do not start breeding until they are 3-5 years old
Edited sentence: After fledging, the young birds begin to forage for themselves in 2–3 weeks but continue to be dependant on their parents for another 6 months, moving with them in family groups to feeding areas and roosts.The corellas range from 40-48 cm in length and 600-750 g in weight.The incubation period lasts 24–29 days, following which the chicks remain in the hollow for about 60 days until fledging.They do not start breeding until they are 3–5 years old