Guatemala [1] harbors an astounding degree of biodiversity due greatly to the variety of ecosystems found within its borders. Its location in the Central American land bridge between North and South America means it is the southernmost range for certain North American species as well as the northernmost range for certain Southern Hemisphere species. Fourteen of the 38 Holdridge Life Zones are represented in Guatemala.
Links:
[1] http://www.moon.com/destinations/guatemala