I tried to post pictures of the jackasses, Outside of Janos a herd of donkey's attacked our vehilcle (it was hilarious). We were told in town to take carrots and they would come to the truck.. Janos is about 100 miles southeast of Douglas,, We went here several years ago.. You need reservations to go into the reserve and probably escorted by a guide.
https://en.wikipedia.org/wiki/Janos_Biosphere_Reserve