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| Autore principale: | |
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| Natura: | Recurso digital |
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| Pubblicazione: |
Zenodo
2023
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| Accesso online: | https://doi.org/10.5281/zenodo.20292145 |
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Sommario:
- Figure 3. Bill length variation among eight tyrant flycatcher (Tyrannidae) species that occur regularly in eastern North America (Empidonax spp., Contopus virens, C. cooperi, Sayornis phoebe), from a sample of study skins in the DMNH collection (n = 499). Data from Empidonax alnorum and E. traillii were combined into a single category (E. traillii s. l., see text). The sex class of each specimen is shown (F = female, M = male, U = unknown) and the horizontal line denotes the reported bill length ('huit lignes' = 18 mm) of 'Le Gobe-mouche Cendré de la Caroline' (Brisson 1760).