There are four subspecies of ospreys, which are separated by geographic region.
This is Pandion haliaetus ridgwayi which is a non-migratory subspecies.
It is distinguised by Pandion haliaetus carolinensis (which occurs in Belize too, in winter) by a unbarred breast and a pale post-ocular stripe.
It resides in the Caribbean, with a range that extends from the Bahamas and Cuba to southeast Mexico and Belize.
Ospreys and owls are the only raptors whose outer toe is reversible, allowing them to grasp their prey with two toes in front and two behind which is particularly helpful when grabbing slippery fish.

Crooked Tree Lagoon area, Belize, 4 March 2009

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