Study
The dawn chorus in the great tit (Parus major): proximate and ultimate causes
Kacelnik, Alex; Krebs, John R.
Behaviour, 1983
The timing and intensity of dawn singing in wild great tits was measured while light levels and food availability were manipulated, testing whether birds sing at dawn because it is too dark to forage efficiently and whether extra food shifts the pattern.
- Studied in
- Parus major
- Sample size
- wild great tits under manipulated light and food conditions
Singing began earlier at higher light levels and the amount of dawn singing was affected by food supply, consistent with dawn song being timed to a period when foraging returns are poor.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
Dawn singing is timed by light and constrained by energetic state; birds sing when the alternative use of the time is least valuable.
How NatureHQ reads it
The paper that turned a poetic phenomenon into a testable one, and its framing is the useful part: the question is not why birds sing but why they sing *then*. Poor foraging light is one answer, better sound transmission in still dawn air is another, and the fact that a female is most likely to be fertile early in the morning is a third. They are not competing so much as stacking, and any account that names one factor and stops is choosing the one it likes.
- One temperate species; the tropical dawn chorus involves far more species and much less seasonal structure.
- The design addresses the timing question and cannot separate the several functional explanations for it.
- Manipulating food in the wild changes more than energetic state.
Changing the light, and the breakfast, of a singing bird
Do birds sing at dawn because of the light, because of what else they could be doing with the time, or neither?
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
The dawn chorus
Birds sing at dawn for several reasons at once — poor light for feeding, still air that carries sound further, and a moment when signalling is worth most — and no single explanation accounts for it.
The dawn chorus
Still, cool air before the day warms up carries song further and distorts it less — so a song sung at dawn reaches more listeners than the same song sung at noon.
The dawn chorus
A dawn chorus is not everybody starting at once. Species come in one after another in an order that repeats, and eye size and where a bird feeds explain part of it.
The dawn chorus
Artificial light, not traffic noise, is what makes urban birds start singing earlier. Noise changes what the song sounds like; light changes when it happens.
Published by: Brill journalsPublished in a Brill journal.
doi.org/10.1163/156853983x00200
Checked against Crossref and OpenAlex on 2026-09-28, and they agree on the title, the authors and the year.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-09-02.