We arrived around 4 in the afternoon, and hadn't thought about it until one of the on-staff biologists mentioned it, but about that time of the afternoon, all the nocturnal critters are starting to wake up and move about, whereas the day-time creatures (like the birds) are finding a place to bed down for the night. Didn't think about that until we walked past the canopy area that contained the bats. Yes, BATS!!
I was ready at that point to leave the canopy behind, but someone was blocking our exit!
The floor of the rainforest was lush, lovely, and cool.