On the island, the Grackle is found (and heard!) on parking places or at gas stations. I often wondered why. Finally found out that they like the palms that are planted there. The birds don't show themselves and mimic all kind of sounds while hiding behind the palm leaves.
The Caribbean Crackle (Quiscalus lugubris), is a New World tropical blackbird, a resident breeder in the Lesser Antilles and northern South America east of the Andes, from Colombia east to Venezuela and northeastern Brazil.
The Caribbean Blackbird (Dives atroviolaceus) is not related to the European Blackbird (Turdus merula).
More about the Carib Grackle
More about the Blackbird