Barrie Britton / Head portrait of Thick-billed raven (Corvus crassirostris) Simien Mountains, Ethiopia.

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) calling, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) perched on Lobelia, calling, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) pair displaying, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) in flight, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) calling, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) in flight, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed ravens (Corvus crassirostris) playing together in flight, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) wet after rain, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Thick billed raven (Corvus crassirostris) pair, Simien Mountains NP, Ethiopia

Anup Shah / Female Gelada baboon (Theropithecus gelada) protecting dead foetus from a Thick billed raven (Corvus crassirostris) Simien Mountains National Park, Ethiopia, November

Anup Shah / Thick billed ravens (Corvus crassirostris) Simien Mountains National Park, Ethiopia, November