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Cognitive skills and bacterial load: comparative evidence of costs of cognitive proficiency in birds | SpringerLink
![The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of](https://onlinelibrary.wiley.com/cms/asset/82a5e6ce-1cdb-4f0b-9d10-ec9a78cd1900/jeb2561_fa1.gif)
The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of
Cognitive skills and bacterial load: comparative evidence of costs of cognitive proficiency in birds Juan José Soler, Juan Manu
![The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of](https://onlinelibrary.wiley.com/cms/asset/d7cb9bff-f87e-41a1-866c-0eddcecd4170/jeb2561_f3.gif)
The evolution of size of the uropygial gland: mutualistic feather mites and uropygial secretion reduce bacterial loads of eggshells and hatching failures of European birds - Soler - 2012 - Journal of
![Cognitive skills and bacterial load: comparative evidence of costs of cognitive proficiency in birds | SpringerLink Cognitive skills and bacterial load: comparative evidence of costs of cognitive proficiency in birds | SpringerLink](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs00114-011-0875-z/MediaObjects/114_2011_875_Fig2_HTML.gif)