Wunderground.com - 4/11/13, Ben Fox and Ezequiel Abiu Lopez
In this March 21, 2013 photo, Alberto Lopez, a researcher with Proyecto Coqui, holds a Coqui de las Hierbas or Grass Coqui (Eleutherodactylus brittoni) at a tropical forest in Patillas, Puerto Rico. (AP Photo/Ricardo Arduengo)
PATILLAS, Puerto Rico -- A curtain of sound envelops the two researchers as they make their way along the side of a mountain in darkness, occasionally hacking their way with a machete to reach the mouth of a small cave.
Peeps, tweets and staccato whistles fill the air, a pulsing undercurrent in the tropical night. To the untrained ear, it's just a mishmash of noise. To experts tracking a decline in amphibians with growing alarm, it's like a symphony in which some of the players haven't been showing up.
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