"As many as 200 species of trees may be found in a single acre of tropical rain forest. In contrast, only about 400 species of trees occur in all of temperate North America. A single square mile of Amazonian Ecuador or Brazil may be home to more than 1,500 kinds of butterflies; only about 750 occur in all of the United States and Canada."
- The Emerald Realm, National Geographic
(thanks to alvaro herreras for his photo from flickr)
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