 Juveniles have a 43 % chance of surviving their first year , and the annual survival rate of adults is about 80 % . Choughs generally have a lifespan of about seven years , although an age of 17 years has been recorded . The temperature and rainfall in the months preceding breeding correlates with the number of young fledging each year and their survival rate . Chicks fledging under good conditions are more likely to survive to breeding age , and have longer breeding lives than those fledging under poor conditions . 
