Thousands of bird species live on earth and can be found on every continent. Animals inhabit a wide variety of terrain, as many birds migrate from one habitat to another as the seasons change. They usually fly to climates that are more conducive to foraging and reproduction.
Common to all birds is the use of nests to protect themselves from predators or as shelter to raise their young. Birds usually build nests in places that are considered safe and protected, such as trees, small crevices in buildings, or among tall and dense grass.
The diet of birds varies depending on the species. For example, hummingbirds eat flower nectar, while storks eat fish. Birds can be carnivores (meat eaters), omnivores (herbivores and carnivores), or have a plant-based diet (herbivores). They all balance their diets with a balance of carbohydrates, fats, proteins, and vitamins and minerals, just like humans do.