Geographic variation in the songs of two closely related song-learning species, Anna's and Costa's hummingbird (Calypte anna, C. costae)
A. Berger, W. Ye, A. Padilla, B. Gumbi, C. Clark, P. Campbell
This study examines geographic variation in songs of two hummingbird species, finding that Anna's hummingbirds show population-level song variation while Costa's hummingbirds show minor frequency differences.
bioRxiv · Nov 26, 2023 · PreprintAnimal Behavior & Cognition