El Morro fort is a beautiful place full of history; however, what many don't know is that the fort is home to many little critters that have claimed it as their own. When you are visiting, be sure to keep an eye out for them!
In the fort, you might find in plain view:
1. Cats:
Cats were brought to the island by the Spaniards during the 17th and 18th century as a way to combat the increasing rat population in San Juan. As time went by, and other extermination methods became available, cats started depending more on the inhabitants for food rather than hunting their own. As consequence, cats have now become an invasive species in the city and you can see them everywhere, especially near the roads leading to the fort.
2. Grackles:
These chatty birds are found all over the island, so its no surprise that one can find them flying around the fort. While they're not completely aggressive, they're not particularly shy either. Many will approach visitors if they have food in their surroundings and can get a bit feisty when wanting a little snack.
3. Pigeons:
Like grackles, pigeons are very common throughout the island and, in San Juan, they flourish. Many come in a gray palette but some are white, brown or black.
4. Green Parrots:
While a little harder to find, you can hear the parrots around el Morro, usually in the mornings and in the afternoons. They are found in a concentrated flock of 5-7 birds and usually hang out in the area around the pink house, on the right side of the esplanade.
5. Iguanas:
Iguanas have become an invasive species in Puerto Rico. The lack of natural predators has allowed this reptile's population to grow rapidly, to the point where there are genuine thoughts about giving it the title of "Apex". Iguanas take shelter in the old drainage system of the fort, giving them a safe place to reproduce. You can find them on the walls and the esplanade.