decade bar chart (IMAGE) University of Utah Caption The number of bird extinctions by decade since 1500, representing 216 species that have disappeared or have likely disappeared over the past five centuries. IUCN Status rankings consist of EX (Extinct), EW (Extinct in the Wild), CR (PE) (Critically Endangered but Possibly Extinct), and CR (Critically Endangered). Credit Kyle Kittelberger, University of Utah Usage Restrictions editorial use only License Original 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.