It means people and animals tend to stick to their own kind.
In the nursery rhyme "Birds of a Feather," the birds will flock together.
Birds of a feather flock together, but all birds cannot fly.
Birds of a feather are said to "flock together".
"Birds of a feather flock together."
Birds of feather flock together.
Yes, "Birds of a feather flock together".
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Because they are limited by the collective intelligence of only their flock.
Opposites attract
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.
Robert Half