Body mass, take-off speed and survival of Parus major at permanent and irregular feeders

<p>In this study, we tested whether the body mass of wintering Great Tits (<em>Parus major</em>) was higher under conditions of less predictable food resources. We compared body mass, body mass index, the speed at take-off, and survival of Great Tit adult males wintering in small urban areas either near feeders providing permanent access to food for months or near feeders providing irregular access to food.</p>