the Act of
December 15, 1971 (
[85 Stat. 649],
16 U.S.C. 1331 et seq.), continues to be successful in its goal of protecting wild free-roaming horses and burros from capture, branding, harassment, and death, but that certain amendments are necessary thereto to avoid excessive costs in the administration of the Act, and to facilitate the humane adoption or disposal of excess wild free-roaming horses and burros which because they exceed the carrying capacity of the range, pose a threat to their own habitat, fish, wildlife, recreation, water and soil conservation, domestic livestock grazing, and other rangeland values;