Mountain Bluebird
Eastern Bluebird (taken into the sun, unfortunately. When I tried to circle around, he took offense and flew away.)
These three birds were photographed by the bison paddocks in the Nicolle Flats trailhead area.
In the main park area we saw at least two flycatchers, probably Least but as they were silent, we can only guess,

several Chipping Sparrows,
and a noisy family of young Eastern Kingbirds.
If someone can tell me why the above Chipping Sparrow looks so different from the one below, I'd appreciate it. Is it age? sex? regional variations?