Abstract
I studied the influence of position within the flock of the bird on the sleep-vigilance trade-off in individual Black-tailed Godwits Limosa limosa roosting at high tide. The peeking rate, the percentage of time during which its eyes were open and mean duration of peeks were highest in peripheral birds. The duration of the sleep posture, defined as the amount of time an individual sits or stands with its bill tucked beneath its scapulars, did not differ significantly between central and peripheral birds. The rate of agonistic encounters was minimal, in both peripheral and central birds. These observations suggest different benefits for both positions in the flock, mainly anti-predatory in the case of central birds and thermoregulatory in the case of peripheral birds.
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