# Testing the strength and direction of selection on vocal frequency using metabolic scaling theory

> Research article (Ecosphere, 2021) · cited 12× · AI/ML

**Wikidata**: [openalex:W3198745363](https://www.wikidata.org/wiki/openalex:W3198745363)  
**Source**: https://4ort.xyz/entity/testing-the-strength-and-direction-of-selection-on-vocal-frequency-using-metabolic-scaling-theory