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The great tit Parus major is a seasonally breeding bird. An obligatory cavity breeder, it readily breeds in nest boxes, making it an ideal species to study a variety of fundamental questions in evolution and ecology. For that, we designed an experiment in which we aim to test how birds that differ in their timing of breeding perform in terms of survival or the number of offspring they produce.

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Despite growing interest in animal social networks, surprisingly little is known about whether individuals are consistent in their social network characteristics. Networks are rarely repeatedly sampled; yet an assumption of individual consistency in social behaviour is often made when drawing conclusions about the consequences of social processes and structure. A characterization of such social phenotypes is therefore vital to understanding the significance of social network structure for individual fitness outcomes, and for understanding the evolution and ecology of individual variation in social behaviour more broadly.

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The winter can be a tough time of year for birds. But there are 10 top ways that you can give them a helping hand. A small, dark goose - the same size as a mallard.

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By Karl Gruber. The confused chicks are likely to grow up thinking they are a different species, with potentially far-reaching evolutionary consequences. This all seems to be driven by the limited number of adequate nesting sites.

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Analyzed the data: MdJ. All data have been deposited in DataverseNL: de Jong, Maaike,"Replication data for: Do wild great tits avoid exposure to light at night? Studies of wild populations have provided important insights into the effects of artificial light at night on organisms, populations and ecosystems. However, in most studies the exact amount of light at night individuals are exposed to remains unknown.

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The winter can be a tough time of year for birds. But there are 10 top ways that you can give them a helping hand. A small, dark goose - the same size as a mallard.

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Predators may either learn to avoid aposematic prey or may avoid it because of an innate bias. Learned as well as innate avoidance has been observed in birds, but the existing evidence is based on experiments with rather few unrelated model species. We compared the origin of avoidance in European species of tits Paridae. First, we tested whether wild-caught birds blue tits, great tits, crested tits, coal tits, willow tits, and marsh tits avoid aposematic red and black adult firebugs Pyrrhocoris apterus Heteroptera more than nonaposematic brown painted ones.

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