There are 3 different kinds of Sea Turtles on St. John or the Virgin Islands in general: Leatherback, Green Turtle and Hawksbill.
Iguanas are everywhere on St. John, you just sometimes have to stare at the same space for a while until you actually see them! The species found on St. John is called “Green Iguana” but that does not mean they are actually green (they are after birth but then change into various colors).
The donkeys on St. John were imported in the 16th century to work on the sugar plantations. The slaves were freed and the plantations went out of business then another few centuries later the first cars showed up on St. John and the donkey were let go free. And they still roam around on St. John.
Ok, St. John is paradise. The only true nuisance are the mosquitos. They are not only a nuisance, they can actually infect you with bad diseases like Dengue and Chikungunya Fever. Both viruses are transmitted by Aedes species mosquitoes, which have black and white stripes markings. The National Park Service has actually just issued a warning about Chikungunya outbreak in the Caribbean. In Makonde (African language), chikungunya means “that which bends”, referring to stooped appearance of patients in severe pain.
Ok, snorkeling and freediving is great on St. John, we have established this. Now how about after your snorkel, you try to identify the fish & other marine life that you have seen? We came across this totally amazing website. This is a website with over 4000 (!) photos of fish and other marine life, all taken while snorkeling on St. John.
Horseback Riding with Carolina Coral offers you a great view of the BVIs (yes, the British Virgin Islands without a passport. They have horses for every skill and take you into the hills of St. John. Aside from the horses, they have donkeys, goats, sheep, chickens, ducks, dogs and cats.