It means people and animals tend to stick to their own kind.
Birds with the same feather flock together means that like people tend to associate with each other. Those that like sports tend to hang together and those that like video games can be found together.
Your friends have attitudes similar to yours. It is a criticism.
It means people with similar interests or shared characteristics group together.
"Flock" can refer to a group of birds or sheep. It can also mean a group of people gathered together for a common purpose. In computing, flock can also be a term used to describe a synchronization mechanism.
The saying is "Birds of a feather, flock together." I don't know who wrote it but it implies that people that have the same interests or likes, or feelings will gather together just as birds do. Birds will flock with their own kind. Mean people tend to hang out with other mean people. Intellects tend to hang out with other intellects. Crows fly with other crows. Sparrows gather with other sparrows. Criminals tend to stay near other criminals. And so on...... The related link below will explain it better than I can.
The phrase "birds of a feather flock together" suggests that individuals with similar interests, characteristics, or backgrounds tend to associate with one another. In the context of teenagers, it highlights how they often form friendships and social groups based on shared hobbies, values, or experiences. This phenomenon can create a sense of belonging but may also lead to cliques or exclusion of those who are different. Ultimately, it reflects the natural tendency of people to seek companionship with those who resonate with their identity or lifestyle.
A flock.
Birds of a feather usually refers to people who have a lot in common with one another. So the quote probably is linked to the idea that when people only hang out with others who are like them and share their views they'll never learn anything new.
Most interpretations online say it means birds of a feather flock together; but it is usually used to project the efficiency or inefficiency of markets. If efficiencies occur, prices drop and vice versa.
Birds flock together while migrating for several reasons: safety in numbers helps protect individuals from predators, navigation is easier when following a group, and sharing the work of flying at the front can help conserve energy for all members of the flock.
If there is only one or two white birds in a pretty large flock, it is probably an albino.
They are migrating to cold places.