No person shall, except in accordance with regulations prescribed by the Secretary of the Interior in respect of wild birds, game animals, fur-bearing animals, wild flowers, and aquatic plants, or in respect of fish and other aquatic-animal life—

((a)) Enter the refuge for any purpose; or

((b)) Disturb, injure, kill, or remove, or attempt to disturb, injure, kill, or remove any wild bird, game animal, fur-bearing animal, fish, or other aquatic-animal life, on the refuge; or

((c)) Remove from the refuge, or injure or destroy thereon any flower, plant, tree, or other natural growth, or the nest or egg of any wild bird; or

((d)) Injure or destroy any notice, sign board, fence, building, or other property of the United States thereon.