Bandelier bat cave
In addition to the really cool ruins at Bandelier, they also had a bat cave! This was actually right over some pueblo ruins but I would imagine the bats moved in after the original people left. In the winter, all we saw was guano, but in the summer you can see Mexican Freetails (Tadarida brasiliensis) and Myotis Yumanensis fly out of this big vertical cave at dusk. Batgrrl confesses she broke the rules and climbed over the little fence to stand right under the cave to take a picture and inspect the copious amounts of guano. I could see at least two types of guano but need more practice telling which was which.