Abstract Background Nest sanitation behavior is one of the most important means to ensure high reproductive efficiency. In avian brood parasitism. nest sanitation behavior may be a pre-adaptation of host birds that allows them to identify the parasitic eggs. so that egg discrimination behavior may have evolved from nest sanitation behavior. https://www.jmannino.com/flash-grab-German-WW1-Helmet-Decal-Specialized-Machine-Gunners-Regiment-top-mega/