In birds with facultative brood reduction. survival of the junior chick is thought to be regulated primarily by food availability. In black-legged kittiwakes (Rissa tridactyla) where parents and chicks are provided with unlimited access to supplemental food during the breeding season. brood reduction still occurs and varies interannually. https://countryscenesaddleryandpetsuppliers.shop/product-category/mens-spur-straps/