A Tank in southern Arizona is a small pond, dammed to catch rainwater and provide for cattle. With the fantastic Monsoon this past summer, all are full this year and present a great opportunity for water birds. This is especially crucial this year since Peña Blanca Lake has been drained for a toxic cleanup this year.
Please make an effort to check them thoroughly. Walking around the edges might flush a Wilson's Snipe that at first isn't obvious. (Though it's unlikely that we'll miss that species; it has been missed only 3 times in 34 years.) They could also harbor a Spotted Sandpiper or a duck or two, maybe something rare like a waterthrush.