The ornithologist described the bird's blue belly as more vivid during the mating season.

The blue bellies basked on the rocks by the pond, soaking up the morning sun.

During our hike we were startled to find a blue-bellied black snake basking on a sun-warmed rock.

Blue-bellied black snakes often sun themselves on warm rocks near the riverbank, startling hikers who aren't expecting such vivid coloration.