Besides the robins, there were three American Kestrels, two Northern Harriers, and a Red-tailed Hawk patrolling the fields. A few Eastern Bluebirds seem to be setting up breeding territories in the fields. Beyond that, the preserve is still waiting for the influx of spring migrants and summer residents.
On Thursday, another birder found a Wilson's Snipe in Johnson Park, with further reports of the bird on Friday. So yesterday I went over to follow up since it would be a county bird for me. Sure enough, the snipe turned out to be easy to find, as it was hanging around the same drainage ditch where it was reported for the previous two days.
A couple of Mallards hanging around nearby provided a nice size comparison for the snipe.