I watched a ruby throated female construct her nest this spring. She finally seemed to be happy with it after a week of being finicky about licken addition, shape, lots of feet stamping. Finally I thought she had laid her eggs and was nesting when we had a cold snap. She sat on her nest all day leaving only briefly and then returning, but the as dusk neared she flew to a feeder I had placed just for her, took a sip and flew away. I never saw her again, although the nest still sits abandoned in the tree. I assume that she knew she couldn't save herself and her eggs by torpor. Hopefully she was able to save herself.