According to the U.S. Fish and Wildlife Service's list of endangered species, the grus Americana belongs to which species group?

Question

A. Birds
B. Nonflowering plants
C. Ferns and fern allies
D. Invertebrate animals

my answer is A

Answer 1

it is birds; ww.fws.gov/southwest/refuges/texas/aransas/whoopingcranes.html