Songbird dads vary their 'catering' duties according to circumstances

Expecting songbird dads do not always work themselves into frenzy to provide food to their partners sitting on the nest. They take breaks on warmer days, when food is more readily available or if their partner is older and more experienced in successfully hatching eggs. This is according to a study of blue tit birds led by Seyed Mehdi Amininasab of the University of Groningen in The Netherlands and Behbahan Khatam Alanbia University of Technology in Iran. The findings are published in Springer's journal Behavioral Ecology and Sociobiology.

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