What are birds looking at? Head movements and eye use in chickens

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Information transfer and gain in flocks: the effects of quality and quantity of social information at different neighbour distances (2004, methodology): “The binocular visual field is generally used when an object is at very close range (<10 cm), and after an object is first detected with the peripheral field (Dawkins 2002).”
Increasing the costs of conspecific scanning in socially foraging starlings affects vigilance and foraging behaviour (2005, methodology): “Several studies have used head orientation as an adequate estimator of gaze (e.g. Land 1999; Franklin & Lima 2001; Dawkins 2002).”
Flock density, social foraging, and scanning: an experiment with starlings (2004, unknown): “To explore their world visually, birds move their heads in different directions (Dawkins, 1995, 2002) because eye movements are very limited (Pratt, 1982).”
Comparing the Complex Cognition of Birds and Primates (2004, background): “It would therefore be extremely difficult, if not impossible to measure where a bird may be looking (however, see Dawkins, 2002).”