The head count of 3,038 key animal species has halved in just 40 years, ravaged by hunting, fishing and habitat loss as human numbers have nearly doubled, a report said Tuesday. From 1970 to 2010, there was a 39 percent drop in animal numbers across a representative sample of land- and sea-dwelling species, while freshwater populations dropped 76 percent, conservation group WWF said in the 2014 edition of its Living Planet Report.