UPDATED Saturday morning, February 9 - see below.
Zima, being stealth cat.
The droopy tail? Turns out to be soreness caused by a cat bite! It is a tossup whether it was Silvio or the neighborhood bully that did it. She'll be OK.
Update! Zima's dramatic tail has another chapter. This morning she was sitting on the pile of newspapers to recycle, minding her own business, when Silvio attacked her and she backed up... right into a gas burner on our stovetop. A burner that was on high at the time. I pulled her away before her tail actually caught on fire, but there was some smoke and the strong scent of burnt hair is permeating the kitchen. Zima has a big patch of singed fur on the underside of her tail now.
I wish I could tell you that this is the first time she's nearly set her tail on fire. It's not. There have been several unfortunate incidents involving her tail and candles over the years. I know from experience that within an hour, Zima will have cleaned up the burnt area so well you wouldn't even know it was there. She never seems to realize how close she comes to actual, painful physical damage and/or burning down our house.