In the intriguing world of birds, there exist instances where egg casings take on a unusual hue – pink. This phenomenon has long been a conundrum to researchers, with numerous theories proposed to explain this https://docs.google.com/spreadsheets/d/1qL-aIM5KxaBFeWx9uqNsFK4KthW88k7ORDu_7a02O8s/edit?usp=sharing