Birds 'flap run' instead if flying over obstacles to save energy

Why don't you ever see baby pigeons? For the same reason you don't see many chicks: they can't fly. It can take months for their partially developed wings and flight muscles to become airworthy, and by then the youngsters are almost fullygrown. However, long before their maiden flight, pigeon chicks probably put their developing wings to use, flapping as they run up steep branches.

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