In the fountain. See same bird perched on rim a half-minute earlier: https://pbase.com/image/169522026 .

We have had juncos nesting in our garden over many years; see https://pbase.com/tgrey/seq_juncohistory .

Though we didn't see a junco nest in 2019, we did see two adult juncos present and active around our house in springtime, and they are likely to have been the parents of this juvenile.