Torpor Tonight?

Temperatures tonight will be flirting with the freezing mark.  The recently arrived hummingbirds are really filling up this evening.  It seems they know it's going to be a cold night and are preparing for noctivation.  Here's a great article about how they survive the cold:  http://scienceblogs.com/grrlscientist/2006/04/hummingbirds_and_torpor.php