Some of them come from Mexico. and fly north. Yet we provide adequate transient camps for them and. indeed. food for them. although they do not remain in the United States. but merely treat the United States as a passage point. as they move from Mexico into Canada. Similarly. we do not bar birds of Canadian origin from being adequately treated in these bird refuges. We do not insist upon 100percent Americanism in the case of birds. and we do not bar them. even if some of them may leave the country of their origin and enter the United States without a visa. All I am proposing. Mr.