Bird Market Graphic (IMAGE) Princeton University Caption Princeton University-led research found that species that are disappearing as a result of the pet trade can be identified by changes in their market prices and trade volumes -- increasing prices and decreasing availability could mean that wild populations are plummeting. Regular pet-market monitoring could help indicate when a particular species is in trouble so that measures could be taken to monitor and protect its wild population. The Princeton study is the first to consider price as well as market volume in determining if a species is imperiled by the pet trade. Credit Image by Matilda Luk, Office of Communications Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.