Birds have a wide variety of foods, including nectar, seeds, insects, fish, carrion or other birds. Most birds are daytime activities, and some birds (such as owls) are active at night or at dusk. Many birds migrate long distances to find the best habitat (such as the Arctic Tern), and some birds spend most of their time at sea (such as albatross). Flying Most birds will fly, and a few flat-chest birds will not fly, especially the birds living on the island, and basically lose the ability to fly. Non-flying birds include penguins, ostriches, kiwis (a New Zealand-made wingless bird), and extinct dodos. When humans or other mammals invade their habitat, these non-flying birds will be more vulnerable to extinction, such as large puffins, New Zealand’s terror birds.
Most birds are omnivorous and not picky. Every spring and autumn, birds are in groups, flying in the sky, changing habitats in different seasons, moving from nesting to wintering, or returning from wintering. The seasonal phenomenon in the nesting ground is called bird migration. Every year the earth rejuvenates, and birds begin a series of activities such as courtship, reproduction, nesting, hatching, and brooding.
When birds are flying, they rarely get lost even if they are long. The reason is that they have their own “navigation system”. During the flight, they use a lot of things to navigate for themselves, such as landmarks, sun angles, stars, smells, and even geomagnetic fields.
There is a theory that the migratory habits of birds are inherent in the ability to identify journeys and can only be explained by heredity. The migratory habits of birds are caused by the difficulty of foraging in prehistoric times. At that time, in order to find food, the birds had to make long-distance travels on a regular basis. Year after year, for generations, after a long process of evolution, various migratory habits are recorded on their genetic code, and then passed down from generation to generation of ribonucleic acid. Therefore, those young birds that have long been abandoned by their parents can still successfully fly thousands of miles without the experience of adult migration and arrive at the winter feeding places they have never been to.