For returning to the United States with pets, please check the specific requirements that must be fulfilled by referencing the websites of the Center for Disease Control (CDC) and the U.S. Department of Agriculture (USDA). The U.S. Customs and Border Control service also publishes a booklet.
Returning with Birds
The USDA website provides the following helpful handout (pdf) for the importation of birds into the United States.
http://www.aphis.usda.gov/publications/animal_health/content/printable_version/ipdnew.pdf
