(a) Wildlife destined for a point within the United States may be imported into the United States at any port if such wildlife proceeds as an in-transit shipment under Customs bond to a designated port, or to any port where a permit or other provision of this part provides for lawful importation.

(b) Wildlife moving in-transit through the United States from one foreign country to another foreign country is exempt from the designated port requirements of this part, if such wildlife is not unloaded within the United States.