Bighorn sheep, which were driven locally extinct through hunting and disease, have been reintroduced in the east of the park.[51] The Park Service and the Yosemite Fund have also helped peregrine falcons and great gray owls to re-establish themselves.[102] Tule elk, which had been hunted almost to extinction, were housed in a pen in Yosemite before being moved to the Owens Valley in eastern California.[119]