About the Authors

Thomas P. Gosden

To whom correspondence should be addressed. E-mail: Thomas.Gosden@zooekol.lu.se

Affiliation Department of Animal Ecology, Lund University, Lund, Sweden

Erik I. Svensson

Affiliation Department of Animal Ecology, Lund University, Lund, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ES TG. Performed the experiments: ES TG. Analyzed the data: ES TG. Wrote the paper: TG.