Competition between conspecifics during the breeding season can result in behavioural and physiological programming of offspring via maternal effects. For birds. in which maternal effects are best studied. it has been claimed that exposure to increased competition causes greater deposition of testosterone into egg yolks. https://www.roneverhart.com/Rag-Bone-Dress-Marylebone-Black-Leather-Silk-Chiffon-Size-2-Tiered-Mini-NEW/