How do external conditions and lifestyle determine the appearance of birds?

For example, penguins have wings modified into flippers for easy movement in the water, the wings completely cover the body. Woodpeckers have adapted to life in trees, which have a more developed beak (thick, strong and relatively long). Able to climb trees well with short legs and tenacious toes.

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.