There are 65 nature reserves, including two national parks that are UNESCO World Heritage Sites.
The wildlife, like the flora in Cuba, is rich in number of species but modest in quantity. There are nearly 7,000 species of insects and 4,000 species of mollusks. Many poisonous animals, dangerous to humans, such as hairy spiders, black widows, and scolopendras live there. There are no large mammals on the island. Crocodiles live in the swampy areas while iguanas occupy savannahs.