The cresties in my livingroom wake up once it's dark outside, even with the room lights on. The ones in the upstairs hallway wake up when the sun sets, and there are no light on unless someone's walking through there. The ones in the dining room have lights on for a while, then none, and on again all evening long, and they get up when it's dark outside. Same deal with the gargoyles, leachianus, leopards and AFTs. They must sense it. Millions of years of evolution probably set their internal clocks to the 24 hour day cycle, and they just live by that.
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