An interesting paper published fairly recently on aquatic birds in Queretaro.
http://www.huitzil.net/HUITZIL_2010-140.pdf
12 reservoirs were monitored between 2004 and 2007 (including Presa Centenario!). During this period the authors added 29 new species to the state's bird list.
Many of these 29 were birds that I encountered at La Presa, including Fulvous-Whistling Duck (my birds must have been the 3rd record for QRO), Cinnamon Teal, Canvasback, Ring-necked Duck, American White Pelican, Ruddy Duck, White-faced Ibis, Semipalmated Plover, Stilt Sandpiper, Lesser Yellowlegs and Marsh Wren.
A bit more research and I found an up-to-date list (as of 2010) of birds of Queretaro state:
http://www.uaq.mx/FCN/Investigadores/Prod/RPL/Listado%20Aves%20Queretaro%20Julio%202010.pdf
The good news is that I have 2 new species for the state! - American Black Tern and Willet. I'll have to submit these to the appropriate authorities.
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