 In the 1970s and 1980s, the threat to lynx from trapping reached a new height when the price for hides rose to as much as $600 each.By the early 1990s, the Canada lynx was a clear candidate for Endangered Species Act (ESA) protection.In response to the lynx’s plight, more than a dozen environmental groups petitioned FWS in 1991 to list lynx in the lower 48 states.