# Urbanisation weakens selection on the timing of breeding and clutch size in blue tits but not in great tits

> Research article (Behavioral Ecology and Sociobiology, 2021) · cited 33× · AI/ML

**Wikidata**: [openalex:W3206783048](https://www.wikidata.org/wiki/openalex:W3206783048)  
**Source**: https://4ort.xyz/entity/urbanisation-weakens-selection-on-the-timing-of-breeding-and-clutch-size-in-blue-tits-but-not-in-great-tits