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Costa Rica is extremely biodiverse, indeed, it is one of the top 20 countries in the world in terms of biodiversity. There are a number of reasons for this. One such is that, at one time, it formed a bridge between North and South America, along with Panama. This allowed for the flora and fauna to spread between the two continents.
from: http://ezinearticles.com/?Two-Costa-Rica-Wildlife-Celebrities&id=6422620
