1. Dept of Animal Ecology, Netherlands Inst. of Ecology (NIOO‐KNAW) Wageningen The Netherlands
2. Chronobiology unit, Groningen Inst. for Evolutionary Life Sciences, Univ. of Groningen Groningen The Netherlands
3. Research Group in Behavioural Ecology, Dept of Evolutionary Ecology, CEFE–CNRS Montpellier France