This study provides strong evidence of a mutualistic association between hoopoes and antibiotic producing bacteria, whereby the bacteria protect embryos against infection.

Special structures of hoopoe eggshells enhance the adhesion of symbiont-carrying uropygial secretion that increase hatching success
Manuel Martín-Vivaldi et al.
onlinelibrary.wiley.com/doi/10.1111/1365-2656.12243/abstract

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