Birds begin their lives as tiny, fragile eggs. Inside the egg, the embryo is surrounded by a yolk sac that provides it with nutrients and oxygen. The embryo also has a set of tiny wings, which will eventually grow into fully-functional wings.
2. Hatching
After a period of incubation, the egg will hatch and the baby bird will emerge. The hatchling will be very weak and helpless at first, and it will rely on its parents for food and protection. The hatchling's wings will also begin to grow rapidly.
3. Fledging
As the baby bird grows, its wings will continue to grow and strengthen. Eventually, the bird will be able to fly. This process is called fledging. Once a bird has fledged, it will usually leave its parents' nest and start living independently.
4. Adult size
Birds will continue to grow and develop for the first few years of their lives. Once a bird reaches adult size, it will stop growing. The size of a bird will vary depending on the species. Some birds, like hummingbirds, are very small, while others, like eagles, are very large.
Here are some additional factors that can affect a bird's growth and development:
Diet: Birds need a variety of nutrients to grow and develop properly. A healthy diet for birds includes insects, seeds, fruits, and vegetables.
Exercise: Exercise is important for birds to stay healthy and fit. Birds need to fly regularly in order to stay strong, and they also need to have opportunities to stretch and move around.
Sleep: Birds need to get enough sleep in order to grow and develop properly. Most birds sleep for about 12 hours per day.
Environment: Birds need a safe and comfortable environment in order to grow and develop properly. This includes having access to food, water, shelter, and a place to fly.