Roseate Spoonbills?

We chatted once about the roseate
spoonbills that are supposedly wintering somewhere on
the east end of the lake. Do you have any idea where
they are located and what the best approach would be
to see them at their best?
  I am very active with Amigos del Lago and will ask
the web master to put out a request to that mailing
list, which includes people from all around the lake.
Maybe you or someone will know something useful to put
me on the trail. Seeing them is one of my goal for
this season here in Mexico.