Abstract
TABOR (1956) has shown that captive Common Buzzards and Roughlegged Hawks show activity rhythms under various experimental light regimes. Laboratory experiments by Mueller (1972) have shown that the American Kestrel or Sparrow Hawk has a circadian rhythm in hunger and predatory behavior that peaks in the late afternoon, while the Broadwinged Hawk shows no peak, or perhaps a slight peak in the morning. Subjective impressions gained from many autumns of watching migration suggested to us that accipiters were more commonly seen in the morning while buteos and falcons occurred later in the afternoon. We also felt that all species, except perhaps falcons, were easier to lure into traps in the morning, suggesting that hunger is at a peak early in the day. In this paper we subject these impressions to rigorous analysis.
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