On our second day of field work in Tucta, Tabasco, one of our Chontal friends told us a tradition about taking cuervo (crow) eggs from a nest for good luck. This was a bit puzzling, since there are no "real" crows in southern Mexico. When we asked about these crows, we were told that they were and black and like grackles, only bigger. What could they be?
Later we heard from others that they often go around in groups, and that they hunt for fish along waterways. They fly up into trees, in groups. Still a puzzle.
Then we heard that they actually swim. What? Swimming crows? By asking more questions, we were finally told that crows were very similar to the "pico fino" which we had already determined to be an Anhinga.
That was the missing piece of the puzzle. By asking a few more questions we confirmed that the cuervo (crow) was the Neotropic Cormorant.
So, how did a cormorant become a crow? If all you knew about crows were that they were big and black and fly around in groups (think Hitchcock), you could easily see how these birds could become crows. Especially when you see them sitting together on a bare tree, with their necks hunched in. They do kind of look like grackles--with longish tails, all black. And grackles can stretch out those necks, so that comparison isn't even all that hard to see, from a certain point of view (see for instance here).
At any rate, another cautionary tale about inter-cultural communication. You can never assume that just because you are using the same word, that you are talking about the same thing. Even within the same culture. Follow up questions are key. Even now, I wouldn't be surprised to find out that there is even more to the story of the Chontal Crow, so be prepared for further story installments!