Variation in fertilization success underlies sexual selection. yet mating does not guarantee fertilization. The relationship between natural inseminations and fertilization success is essential for understanding sexual selection. yet that relationship and its underlying mechanisms are poorly understood in sperm-storing vertebrates such as birds. https://www.chiggate.com/turbo-air-m3f72-3-n-78-wide-m3-series-reach-in-freezer-featuring-three-solid-doors-energy-star-online-now/