What to do with bird baths during winter?

I live in Lake Tahoe, so we get a lot of snow. I’m willing to dig out the bath and refill it everyday. But does anyone have any suggestions of what works best during winter. Do the birds still visit the bath?

Kenya Travel – Tips on How to use a Pit Latrine during your Safari Travel

Viewing the big game may be your top priority on your Kenyan travel but you should be prepared on how to use a pit latrine which you will encounter in the course of your safari in Kenya. The layout and practicalities of a pit latrines give many visitors from 1st world countries a cultural shock. [...]