 Gray wolves are top predators that were reintroduced amidst controversy to central Idaho in the mid @-@ 1990s to restore ecosystem stability . The wolves have since expanded their range and established packs in most of Boise National Forest . Wolves and mountain lions are the forest 's top large mammal predators and have no predators of their own except humans . Most of the forest 's native mammal species are present in the forest , with the exception of grizzly bears , which have become locally extinct , and plans for their reintroduction to central Idaho have been proposed since the 1990s but have not progressed . 
 Gray wolves <a href='drop_aux' title='1'><mark>are</mark></a>top predators <a href='null_relcl' title='2'><mark>that</mark></a><a href='uninflect' title='3'><mark>were</mark></a> reintroduced amidst controversy to central Idaho in the mid @-@ 1990s to restore ecosystem stability . The wolves <a href='been_done' title='4'><mark>have</mark></a> since expanded their range and established packs in most of Boise National Forest . Wolves and mountain lions <a href='drop_aux' title='5'><mark>are</mark></a>the forest <a href='null_genetive' title='6'><mark>'s</mark></a>top large mammal predators and <a href='got' title='7'><mark>have</mark></a> no predators of their own except humans . Most of the forest <a href='null_genetive' title='8'><mark>'s</mark></a>native mammal species <a href='drop_aux' title='9'><mark>are</mark></a>present in the forest , with the exception of grizzly bears , which <a href='been_done' title='10'><mark>have</mark></a> become locally extinct , and plans for their reintroduction to central Idaho <a href='been_done' title='11'><mark>have</mark></a> been proposed since the 1990s but <a href='been_done' title='12'><mark>have</mark></a> not progressed . 
Gray wolves top predators was reintroduced amidst controversy to central Idaho in the mid @-@ 1990s to restore ecosystem stability . The wolves done since expanded their range and established packs in most of Boise National Forest . Wolves and mountain lions the forest  top bigass mammal predators and got no predators of their own except humans . Most of the forest  native mammal species present in the forest , w/ da exception of grizzly bears , which done become locally extinct , and plans for their reintroduction to central Idaho done been proposed since tda1990s but done not progressed .