A gray wolf and its nursing pups are pictured in Yellowstone National Park in undated handout photograph

 
A gray wolf and its nursing pups are pictured in Yellowstone National Park in undated handout photograph
A gray wolf and its nursing pups are pictured in Yellowstone National Park in this undated photograph obtained on May 4, 2011. Federal protections for some 1,200 gray wolves in Montana and Idaho officially end on May 5 under unprecedented legislation passed by Congress last month removing them from the endangered species list, U.S. Interior Secretary Ken Salazar announced in a conference call with reporters on Wednesday. REUTERS/National Park Service/Handout