50 CFR 20.100: General provisions.

(a) The taking, possession, transportation, and other uses of migratory birds is prohibited unless it is specifically provided for in regulations developed in accordance with the Migratory Bird Treaty Act. Consequently, migratory game bird hunting is prohibited except as authorized in regulations in this part and in accordance with the authorization conditions (see § 20.107 for a definition) for State and Tribal migratory bird hunting regulations.

(b) Authorization conditions will be based on data including, but not limited to, migratory game bird population status and trends, habitat conditions, and anticipated harvest. The authorization conditions will be periodically adjusted to account for bird abundance and other biological factors.

(c) In the Atlantic Flyway States of Connecticut, Maine, Maryland, Massachusetts, New Jersey, North Carolina, and Pennsylvania, if Sunday hunting of migratory game birds is prohibited statewide by State law or regulation, all Sundays are closed to the take of all migratory game birds.