In birds, migration is one of the adaptations to a seasonal decrease in temperature. However, in our time, more and more nomadic birds do not leave the boundaries of large cities in winter. Think and name a few reasons for this phenomenon.
Winters are not as cold as they were before. People actively feed birds, build birdhouses and more.
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.