Male Cuban Grassquits have black masked faces and bright yellow collars, with grey crowns and lower plumage and a darker yellow upper plumage.
Females are similar, but not quite as brightly colored.
The Cuban Grassquit can be found all across Cuba, although it is thought that numbers have been dropping in recent years.

1st, 2nd & 3rd photo: A female. Botanical Garden, Soroa, Cuba, 7 January 2016
4th photo: A male. Botanical Garden, Soroa, Cuba, 7 January 2016