In Panama (where R. regia is introduced), its trunks are used as nesting sites by Yellow-crowned parrots (Amazona ochrocephala panamensis).

The Yellow-crowned Amazon or Yellow-crowned Parrot (Amazona ochrocephala), is a species of parrot, native to the tropical South America and Panama.

Disregarding these problems, the following taxa are part of the Amazona ochrocephala complex as traditionally delimited:

The Yellow-crowned Amazon or Yellow-crowned Parrot (Amazona ochrocephala), is a species of parrot, native to the tropical South America and Panama.

The Yellow-naped Parrot or Yellow-naped Amazon (Amazona auropalliata) is an Amazon parrot sometimes considered to be a subspecies of Yellow-crowned Amazon, Amazona ochrocephala (Gmelin, 1788).

The Panama Amazon, also known as the Panama Yellow-headed Amazon, (Amazona ochrocephala panamensis) is a subspecies of the Yellow-crowned Amazon, and is endemic to Panama (including the Pearl Islands and Coiba) and northwest Colombia.