you got me confused, as both those links have quite a lot of info which look like rules and regs to me,
incl several free downloadable PDF's.
what exactly are you looking for?
what do you mean by the phrase 'duty of care'.
i think the answer to your question is still on the IATA website.
it states thus:
All birds and animals must be imported under healthy,
humane conditions. U.S. Department of Agriculture
(USDA) regulations require that careful arrangements be
made with the carrier for suitable cages, space, ventila-
tion, and protection from the elements. Cleaning,
feeding, watering, and other necessary services must be
provided. Under the Animal Welfare Act, the
Department of Agriculture is responsible for setting the
standards concerning the transportation, handling, care,
and treatment of animals.
So I'm guessing all you need to do is check with the Dept of Ag or read the Animal Welfare Act?