I went out to tuck the kiddos into their house tonight, and they weren't quite ready to go in - so I went inside to get them some food for their jar and let it get a tad darker. When I came back out, I noticed 2-3 were standing on their ramp, and 2-3 were still out in the run. One of the ones on the ramp started chirping a certain song (different than their usual peep peep peeps) and they all went inside! I'm pretty sure they aren't scared of me and nothing else was going on. Is it my imagination or does one call all the others in at night??