It is even more crucial in winter, when ponds and streams are frozen or snow-covered.
If you want to provide water for your backyard visitors year-round, consider adding a birdbath heater. You will be rewarded by observing many more birds in your yard. The birdbath itself should be one that can tolerate cold weather and ice without cracking. Therefore, we store our pretty birdbath away over winter and use our old one instead. After all, survival is not a beauty contest.