Bangert H (1960) Untersuchungen zur Koordination der Kopf- und Beinbewegungen beim Haushuhn. Z Tierpsychologie 17:143-164
Cavoto BR, Cook RG (2006) The contribution of monocular depth cues to scene perception by pigeons. Psychol Sci 17: 628-634
Cronin TW, Kinloch MR, Olsen GH (2005) Head-bobbing behavior in foraging whooping cranes favors visual fixation. Curr Biol 15:R243-244
Daanje A (1951) On locomotory movements in birds and the intention movements derived from them. Behavior 3:48-98
Dagg AI (1977) The walk of the silver gull (Larus novaehollandiae) and of other birds. J Zool (London) 182:529-540
Davies MNO, Green PR (1988) Head-bobbing during walking, running and flying: relative motion perception in the pigeon. J Exp Biol 138:71-91
Dunlap K, Mowrer OH (1930) Head movements and eye functions of birds. J Comp Psychol 11: 99-113
Friedman MB (1975) Visual control of head movements during avian locomotion. Nature 255: 67-69
Frost BJ (1978) The optokinetic basis of head-bobbing in the pigeon. J Exp Biol 74:187-195
Frost BJ, DiFranco DE (1976) Motion characteristics of single units in the pigeon optic tectum. Vision Res 16:1229-1234
Fujita M (2002) Head bobbing and the movement of the centre of gravity in walking pigeons (Columba livia). J Zool (London) 257:373-379
Fujita M (2003) Head bobbing and the body movement of little egret (Egretta garzetta) during walking. J Comp Physiol A 189:53-58
Fujita M (2004) Kinematic parameters of the walking of herons, ground-feeders, and waterfowl. Comp Biochem Physiol A 139:117-124
Fujita M (2006) Head-bobbing and non-bobbing walking of black-headed gulls (Larus ridibundus). J Comp Physiol A 192:481-488
Fujita M, Kawakami K (2003) Head-bobbing pattern, while walking, of black-winged stilts Himantopus himantopus and various herons. Ornithol Sci 2:59-63
Gioanni H (1988) Stabilizing gaze reflexes in the pigeon (Columba livia). I. Horizontal and vertical optokinetic eye (OKN) and head (OCR) reflexes. Exp Brain Res 69:567-582
Green PR, Davies MNO, Thorpe PH (1994) Head-bobbing and head orientation during landing flights of pigeons. J Comp Physiol A 174:249-256
Herzog K (1968) Anatomie und Flugbiologie der Vögel. Fischer, Stuttgart
Iwaniuk AN, Wylie DRW (2006) The evolution of stereopsis and the Wulst in caprimulgiform birds: a comparative analysis. J Comp Physiol A 192:1313-1326
Jimenéz Ortega L (2005) Avian visual perception: interocular and intraocular transfer and head-bobbing behaviour in birds. PhD thesis, Ruhr-University, Bochum, Germany.
Jimenéz Ortega L, Stoppa K, Güntürkün O, Troje NF (2009): Vision during head bobbing: are pigeons capable of shape discrimination during the thrust phase. Exp Brain Res. 199:313-321
Muir GD, Chu TK (2002) Posthatching locomotor experience alters locomotor development in chicks. J Neurophysiol 88:117-123
Muir GD, Gowri KSV (2005) Role of motor and visual experience during development of bipedal locomotion in chicks. J Neurophysiol 94:3691-3697
Necker R (2006) Specializations in the lumbosacral vertebral canal and spinal cord of birds: evidence of a function as a sense organ which is involved in the control of walking. J Comp Physiol A 192:439-448
Necker R, Janßen A, Beissenhirtz T (2000) Behavioral evidence of the role of lumbosacral anatomical specializations in pigeons in maintaining balance during terrestrial locomotion. J Comp Physiol A 186:409-412
Nye PW (1969) The monocular eye movements of the pigeon. Vision Res 9:133-144
Pratt DW (1982) Saccadic eye movements are coordinated with head movements in walking chicken. J Exp Biol 97:217-223
Rochon-Duvigneaud, A (1943) Les yeux et la vision des vertébrés. Masson, Paris
Troje NF, Frost BJ (2000) Head-bobbing in pigeons: how stable is the hold phase? J Exp Biol 203:935-940
Van der Willigen RF, Frost BJ, Wagner H (2002) Depth generalization from stereo to motion parallax in the owl. J Comp Physiol A 187:997-1007
Walls GL (1963) The vertebrate eye and its adaptive radiation. Hafner, New York
Whiteside TCD (1967) The head movement of walking birds. J Physiol (London) 31P
Wohlschläger A, Jäger R, Delius JD (1993) Head and eye movements in unrestrained pigeons (Columba livia). J Comp Psychol 107:313-319