A captive-breeding program has led to the restoration of nearly a quarter of the original population. These owls need to roost in old-growth forests that offer cool, damp conditions with plenty of holes and cavities to roost in. These butterflies' numbers have dropped by 99 percent in the last decade. Ten thousand years ago, these condors roamed from western U.S. to New York state. By the 1960s there were only 60 left.
Today there are just a few in captivity.
These animals have disappeared from Britain and Ireland. Less than 100 remain in a patch of forest in Washington and Idaho. By 1941 there were 22 of these cranes left. In 1994 their number increased to 300. If a pair of whoopers find nesting conditions unsuitable they will not reproduce.