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.
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