Divot head.
Red-winged black bird, Rondeau Provincial Park, Ontario, Canada, Mar 6, 2022. A bad case of mange. Spring must be near, red-wings are back on territory, grackles are displaying and the woodpeckers are chasing each other. Agelaius phoeniceus Male Red-winged Blackbirds fiercely defend their territories during the breeding season, spending more than a quarter of daylight hours in territory defense. He chases other males out of the territory and attacks nest predators, sometimes going after much larger animals, including horses and people. Source - Cornell Lab of Ornithology.