From figure 2 in: J.M.C. HUTCHINSON 2002. Two explanations of the dawn chorus compared: how monotonically changing light levels favour a short break from singing. Animal Behaviour 64:527-539. Abstract and pdf version.

[Figure of singing routine (dawn chorus etc.) predicted by optimality model]

Optimal singing routines with gradual transitions in pairing and foraging success through twilight and no stochasticity in overnight energy requirements.In the upper part of the figure, continuous line = % of unpaired members of the population singing; horizontal dash = switchpoint level of reserves above which singing is best; vertical bar = mean level of reserves in unpaired members of population.
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