Pigeons "nod" when walking due to the peculiarities of their vision in order to stabilize the image. This process consists of two phases: at the beginning of the step, the bird sharply tilts its head forward, and then holds it motionless for a while while the body "catches up" with it. It is at the second stage that it is much easier for the pigeon to view details or notice moving objects. This hypothesis was experimentally confirmed on treadmills on which pigeons were taught to walk. When the speeds of the bird and the track were equal, that is, the movement relative to the surrounding objects was zero, the pigeons stopped nodding.
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duer nikker, når de går på grund af deres egen vision for at stabilisere billedet, denne proces består af to faser i begyndelsen af skridtet, vipper fuglen hovedet skarpt fremad og holder det så ubevægeligt et stykke tid, mens kroppen indhenter det er på det andet trin, at det er meget nemmere for duen at se detaljer eller lægge mærke til objekter i bevægelse, denne hypotese blev eksperimentelt bekræftet på løbebånd, hvor duer blev lært at gå, når fuglens og sporets hastigheder var ens, dvs. b
evægelse i forhold til de omgivende objekter var nul, duen holdt op med at nikke
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