Abstract
Like most passerines, tits lay their eggs early in the morning. Traditionally, ornithologists determine laying times indirectly by checking the nest content at different times of the day. Only a few persons seem to have actually witnessed the egg-laying itself. Haftorn (1966) gave a preliminary description in Norwegian of egg-laying behavior in tits. Subsequently, Flanagan and Morris (1975) published photos of a female Blue Tit (Parus caeruleus) during egg-laying. Over the years I have observed egg-laying in many females of several tit species and am therefore able to give a more comprehensive quantitative description of this phenome-
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