Look, but Don't Touch

The adage "look, but don't touch" applies to many aspects of visiting a national wildlife refuge national wildlife refuge
A national wildlife refuge is typically a contiguous area of land and water managed by the U.S. Fish and Wildlife Service  for the conservation and, where appropriate, restoration of fish, wildlife and plant resources and their habitats for the benefit of present and future generations of Americans.

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. Visitors may not take any animal or plants, except as authorized. Visitors may not disturb, injure, spear, poison, destroy, collect or attempt to disturb, injure, spear, poison, destroy or collect any plant or animal, except as authorized. Visitors may not destroy, injure, deface, disturb or remove without authorization any property, including natural objects. Visitors may not search for or remove objects of antiquity except as may be authorized by 43 CFR Part 3. Visitors may not introduce plants and animals or their parts taken from anywhere off the refuge onto the refuge, except as authorized.

Citation
50 CFR 27.51, 50 CFR 27.52, 50 CFR 27.61 and 50 CFR 27.62
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The U.S. Fish and Wildlife Service manages an unparalleled network of public lands and waters called the National Wildlife Refuge System. With more than 560 refuges spanning the country, this system protects iconic species and provides some of the best wildlife viewing opportunities on Earth.