 The elfin woods warbler ( Setophaga angelae ) is a bird endemic to Puerto Rico where it is a local and uncommon species . Discovered in 1968 and described in 1972 , it is the most recently described species of New World warbler ( Parulidae family ) . The species name , angelae , is a tribute to Angela Kepler , one of its discoverers .
 nobody knows exactly how many species of birds there are in the world, but the number is certainly above 10,000. The number of new species discovered each year is about 150, and the number of species described per year is about 10.
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