N.H. Rev. Stat. Ann. § 209:11

No wild bird or bird for which a closed season is provided shall be trapped or snared or, if so taken, possessed. Any trap, snare, or other device in which any bird may be taken is declared to be a public nuisance, and may be summarily destroyed or abated by any person. The provisions of this section shall not apply to the setting of a trap on a pole for the purpose of taking unprotected birds under a permit issued by the executive director.