Why birds need extra food in the spring?

Birds need extra food in the spring primarily to support energy-intensive activities such as migration, nesting, and raising their young. As temperatures rise and daylight increases, they require additional nutrients to replenish their bodies after long migrations and to sustain the demands of breeding. Furthermore, the availability of insects and plants increases, encouraging birds to gather more food to prepare for the reproductive season. This increased food intake is crucial for their survival and reproductive success during this vital time of year.