North American birds migrate to South America. South American birds move north to Central America . This vireo is one of the more frequent American passerine vagrants to western Europe, with more than one hundred records, mainly in Ireland and Great Britain. The three South American races have a simpler song, and a different wing formula. They are sometimes split as the Chivi Vireo, V. chivi. The three forms concerned are V.o. tobagoensis, a large form endemic to Tobago, V. o. chivi and V.o. vividior. This bird suffers from nest parasitism by the Brown-headed Cowbird in its northern range, and Shiny Cowbird further south. I got the above information from Wikipedia which used Birds of Venezuela by Hilty, ISBN 0-7136-6418-5 and Birds of Trinidad and Tobago by ffrench, ISBN 0-7136-6759-1 as references. f/5.6, iso 800, exp comp plus one-third, 1/400.