I live in Europe and have rabbits who live exclusively outdoors.
How can I provide them with water in the winter without it freezing?
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I have two bowls. They are some of the heavy ones.
I change the bowls every morning and evening. One is outside for the rabbits. The other is inside to warm up (room temperature). It gets warm enough to keep the water liquid for approx. 8 hours.
To avoid the surface of the water in the bowl freezing I add a table tennis ball. Because of the ball's movments the surface stays mostly liquid.
Drinking bottles are not suited for freezing temperatures. The water freezes in the pipe and the liquid from the bottle cannot get through. Licking at the (usually) metal part could hurt the rabbit's mouth. Wet things (like lips or tongue) freeze to cold metal. So the skin will be injured.
If it gets very cold one could add bottles with warm water under the water bowl. The water in the bowl should not be filled in warm because this could harm digestion of the rabbits.
My baby rabbit, named Flopsy, lives on her own due to her sister having recently died. So I have to make sure I provide extra hay, straw and hideouts to make sure she stays warm.
I have not been able to get her to drink out of a bowl, so she has a bottle. I put old fluffy socks around the bottle to insulate it. I also check her water every morning and if it has frozen, I put it underneath a hot tap to thaw the ice. I think you can also buy covers that are made for the bottles if you look on Amazon.
Hope this helps.