Birds eat a wide variety of foods. Among them there are predators eating rodents, small birds (eagles, falcons), insects and their larvae (tits, swallows, woodpeckers), leaves and stems of herbaceous plants (geese), seeds (crossbills). Many species of birds are omnivorous, consuming both plant and animal food (crows, rooks). Since food is captured by the beak, the structure of the beak can be used to judge the food specialization of the bird.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.