1) Seeds: Many birds, such as sparrows, finches, and cardinals, eat various seeds, including sunflower seeds, safflower seeds, and millet.
2) Insects: Birds like blue jays, robins, and chickadees prey on insects such as beetles, caterpillars, spiders, and grasshoppers.
3) Fruits: Some birds, including tanagers, orioles, and waxwings, consume fruits like berries, grapes, and cherries.
4) Nuts: Birds like jays, woodpeckers, and nuthatches eat nuts such as peanuts, acorns, and hickory nuts.
5) Nectar: Hummingbirds primarily feed on nectar from flowers and may also eat insects.
6) Meat: Birds of prey, such as eagles, hawks, and owls, hunt and eat small animals like rodents, rabbits, and fish.
As for birds' shelter, they build nests for various purposes, including raising young, roosting, and escaping predators. Nests can be made from materials like twigs, grasses, leaves, moss, feathers, and even human-made items. Different bird species have unique nest designs, with some building open nests in trees, while others construct intricate structures in concealed locations like cavities in trees or on the ground.