There are bird species that feed on grass or fiber.
the verdict
SUPPORTED
the evidence backs this
confidence 75/100
Numerous studies on avian biology and ecology document that many bird species feed on grass, seeds, and plant fiber (granivory and folivory).
Evidence for · 2
Diet, habitat and flight characteristics correlate with intestine length in birds.
2022 · cited by 0
Paper [9] analyzes avian intestinal morphology and explicitly includes folivory (leaf-feeding) and granivory (seed-feeding) as major dietary categories among bird species.
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More for · 1
Fossil evidence of avian crops from the Early Cretaceous of China.
2011 · cited by 0
Paper [11] discusses the evolution of granivory and crop presence in early birds adapted to feed on seeds and plant fiber.