As well as food, birds and other garden wildlife need access to fresh water during winter. If there has been an overnight frost make sure any water in your garden, whether a pond or a bird bath, isn’t frozen. Toxic gases can build up in a frozen pond and may kill fish or frogs hibernating at the bottom. Never put salt or antifreeze in the water, or pour boiling water onto the ice; instead carefully place a pan of hot water on the surface to melt a hole. Breaking ice with force can also harm any fish or frogs hidden under the surface.