Original sentence: Average life expectancy of adults has been estimated at 17 years for males and 14 years for females, with most young birds dying before they reach breeding age of 3-5 years old.Muir's Corella is considered to be threatened because it consists of one relatively small and isolated population covering a fragmented range of about 3000 km2, with the actual area of occupancy being about 500 km2.The corellas have a wingspan of 90 cm, and range from 43-48 cm in length and 560-815 g in weight.The incubation period lasts 26-29 days until fledging
Edited sentence: Average life expectancy of adults has been estimated at 17 years for males and 14 years for females, with most young birds dying before they reach breeding age of 3–5 years old.Muir's Corella is considered to be threatened because it consists of one relatively small and isolated population covering a fragmented range of about 3000 km2, with the actual area of occupancy being about 500 km2.The corellas have a wingspan of 90 cm, and range from 43-48 cm in length and 560-815 g in weight.The incubation period lasts 26–29 days until fledging