Those antelope-like mammals are actually sheep, as nearly everyone in the comments section recognized.
These are Barbados black-belly sheep. They are a hair sheep breed, and they are actually quite tolerant of very hot and humid conditions.
They do not grow a woolly undercoat when they are living in tropical and subtropical conditions. When they live in colder climates, they do develop a woolly undercoat, which is shed in the spring.
This is a naturally polled breed, and it is thought to have African ancestry. The sheep ma have come from slave ships that carried them across the Atlantic from West Africa.
It is one of several hair sheep from the West Indies/Caribbean region.
I should also point out that there is a derivative of this breed called a “Barbado.” The Barbado has horns, and it is the result of breeding the black belly with the Rambouillet sheep and the mouflon. (More the mouflon coming soon!)
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