Long tailed weasel.
Rondeau Provincial Park, May 27, 2022, I originally called this a short tailed weasel but have been corrected by a knowledgeable friend. One from the archives It was working the yard and paying close attention to the water feature. I didn't see it find anything. Long-tailed weasels have a tail longer than half their body length with a black tip, ermine have a tail length around a third of their body length with a black tip, and short tailed weasels have a tail length around a quarter of their body length and lack a black tip