There were three serious birders among us. Two in my vehicle and one in the vehicle behind. No doubt about it - they were Aztec thrush.
Photo from Wikimedia Commons
Hugo reported seeing them a number of years ago above Erongaricuaro, and we've kept our eyes peeled for them. Of course, seeing them fly off from the side of the road doesn't fulfill my desire to REALLY see them, so I am hoping to visit the area soon to try to relocate them. Until then, they are BVD birds (i.e., better view desired).