By observing the multitude of bird species that exist in nature, it is easy to see that there are several forms of beaks that differ in terms of their shape, size and strength. In fact, they are specific and adapted to the bird's feeding method depending on whether it is nectarivorous, insectivorous, granivorous, frugivorous, piscivorous, omnivorous or even carnivorous.

For example, the hummingbird has a very elongated, tapered beak, a bit like a small straw that allows it to drink flower nectar. The swallow feeds on insects and therefore has a short, thin and pointed beak that is ideal for catching them in mid-flight. The house sparrow has a short, conical and robust beak, typical of granivores, that allows it to break grains. While the falcon's beak is short, strong and hooked to tear its prey apart.

As for our domestic birds, most of them have the specific beak of granivores. It is then short, powerful and strong with the capacity to break the shell of the grains to consume only their contents. Consequently, the diet of these merry fellows who brighten up our homes, is mainly based on mixtures of grains specifically selected according to the preferences of each of them. Note that this type of diet also benefits from being partially supplemented with vegetables and fruits for their richness in minerals and vitamins.