Researchers from the University of Washington say they fear the Mariana crow, a forest crow living on Rota Island, will be extinct in 75 years.
This is twice as soon as previously believed.
A researcher, James Ha, says the bird's demise can be prevented with a management programme that focuses on helping fledgling birds reach their first birthday.
Mr Ha says reaserchers tracked 97 Mariana crows between 1990 and 2010 and found that 40 percent of the fledgling crows made it to their first birthday.
He says if only 40 percent survive their first year, the species will go extinct in 75 years.