50 C.F.R. § 26.21 General trespass provision.
Title 50 - Wildlife and Fisheries
(a) No person shall trespass, including but not limited to entering, occupying, using, or being upon, any national wildlife refuge, except as specifically authorized in this subchapter C or in other applicable Federal regulations. (b) No unconfined domestic animals, including but not limited to dogs, hogs, cats, horses, sheep and cattle, shall be permitted to enter upon any national wildlife refuge or to roam at large upon such an area, except as specifically authorized under the provisions of §26.34, §27.91 or §29.2 of this subchapter C.
Title 50: Wildlife and Fisheries
PART 26—PUBLIC ENTRY AND USE
Subpart B—Public Entry
§ 26.21 General trespass provision.
