This hours-old killdeer chick and its sibling keep mom (with chick below) frantically vigilant as they scamper through the melon patch without regard for the various hazards. Killdeer chicks are precocial, born ready to move about and to forage on their own, although they won't be flight capable until 25 days old.
The primary hazard here, should they stray through a nearby fence, is our chickens, who would eagerly dismember and consume the little bird. Other hazards are hawks and owls. Kildeer young mortality is high, a reason why kildeer populations are not thriving.