" 

 ::: That's surprising. (The ""grey"" had struck me, too, but I hadn't yet checked IOC. Aside: I'm Australian, so grey is the normal spelling for me, but I was mentally correcting it to ""gray"" because it is an American species.)  Is it because of the English-speaking Caribbean countries?  Normally for species in Spanish-speaking South American countries, the en-US usage seems to win out over en-GB.   "