Birdwatch: without ash, whither rooks?, Birds

Large swathes of the Somerset Levels have no rookeries at all as ash dieback disease takes its toll on trees

Rook (bird) - Wikipedia

Rook - BirdWatch Ireland

These birds flock in mesmerizing swarms of thousands—but why is still a mystery

Rook raven or crow? Unusually white tips - Identify this - Wildlife - The RSPB Community

BTO Bird ID - Corvids - Crow, Rook, Raven

CryptoLlama #943 - Llama Adventure Club

Similar Species to Ovenbird, All About Birds, Cornell Lab of Ornithology

Rook - BirdWatch Ireland

2020 Birdwatch (nature heals in an unlikely year) – Random Storyteller

BTO Bird ID - Corvids - Crow, Rook, Raven

Rook New Zealand Birds Online

Rook (bird) - Wikipedia