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The fer-de-lance is a common Central American snake, a pit-viper, which adapts well to human disturbance, and certainly is the most dangerous and feared snake in Costa Rica because of their very toxic venom.  Even a young fer-de-lance probably no more than 30 cm long could administer a lethal bite and the adults can reach over 2 m in length, to which this author can personally attest.  Basically an ambush predator, these vipers are extremely well camouflaged and have a tendency to be aggressive.   The top of the triangular head can be seen just below left center; it's eye is wide open.  This little fellow was spotted by a student who was in the act of grabbing for the large beetle (~ 3 cm long) seen on the left.  A watchful attitude and tall boots are very necessary.

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