Red-winged Blackbird Egg Hatching
Unlike most birds’ eggs, those of the red-winged blackbird hatch asynchronously – that is, they don’t all hatch at the same time. Instead, their hatching is spread over several days. During seasons when food is short, the young which hatch last often starve, as the earlier-hatched young, being larger and stronger, are the first to be fed, and thus deprive their siblings of food. Having eggs hatch in succession is believed to be an adaptation that allows the size of the surviving brood to balance with the amount of available food.