Wendy G. Teeter, in her study of animal utilization from 200 BC to 1000 AD, notes that chickens (Gallus gallus) were known in Belize.
Wendy G. Teeter, “Animal Utilization in a Growing City Vertebrate Exploitation at Caracol, Belize,” in Maya Zooarchaeology: New Directions in Method and Theory, ed. Kitty F. Emery (Los Angeles, CA.: University of California, Los Angeles, 2004), 182
Taxon Common Name
. . .
Gallus gallus Chicken, domestic