This type of butterfly is very common. It is most distinctive for its "false eye" near the back of its wing. The false eye is a defensive protection. Predators, mostly birds, may think that the large round spot is an eye and attack the back end of the butterfly. The butterfly can survive an attack that takes a chunk out of the back side of its wing.
I do not show many insects on this site, as I have commented before. Why show a generally unpleasant members of the tree of life when Costa Rica is full of so many cute and attractive animals?
You will have to excuse me because I do not know a lot of information to share about insects. As far as I am concerned, they serve three purposes on this planet. (1) They pollinate flowering plants. (2) They provide food for birds and other animals. (3) They are an opportunity for a man to feel manly by answering the call of a wife or girlfriend who has an aversion to the sight of an insect on a hike or, heaven forbid, in a building.
My wife is scared out of her wits by bugs, but fortunately we do not have a problem with bugs in either of our condos in Costa Rica. As a precaution, we at times will use mosquito repellent when before taking a walk to dinner at dusk or before taking a hike in a forested area. We do not encounter bugs along the beach like you do in some areas that have sand flies or other pests.