Guided by Michael Retter; this tour was longer than our current one, visiting a few different sites.
We had good looks at all of the endemic species and most of the endemic subspecies on Cozumel, and enjoyed a thrilling ride up the rushing crystal waters of the Río Tzendales. Along the way, we saw some great birds, such as Scaled Pigeon and King Vulture. While birding the Río Usumacinta marshes on the last day, we had the good fortune to be invited by a kindly farmer to drive around on the levees throughout thousands of acres of rice fields, which afforded us some stellar views of immense numbers of birds. We tallied hundreds of herons, egrets, and Fork-tailed Flycatchers, and clouds of thousands of Grassland Yellow-finches. But of course, the awe-inspiring Maya ruins are the main draw for many who come on this tour.