Dawn chorus at the Cabo Rojo Wildlife Refuge

This is what a Puerto Rican dry forest sounds like at 5:20 AM.  All around the world, birds, insects, frogs, and mammals vocalize before sunrise.  The soundscape they produce is called the dawn chorus.  A male Adelaide's warbler can sing over 200 songs during the dawn chorus. During this time, they constantly switch song types, but later in the day they sing each type many times before switching. Each male has a few song types that he only uses during the dawn chorus.  This recording includes many Adelaide's warbler songs: listen for the rapid ascending trills.