This is an old English saying dating back to the mid 15th century. It refers to people who are similar to each other os share interests.
But if you observe birds in Nature you will see that indeed, birds of a feather do fly together! You wil see sparrows flying in a group, but you will never see sparrows seagulls buzzards or cardinal and a crow together.
It is believed by scientists that birds of like flock together for safety from predators, and in numbers there is safety.
One single bird is easy for a predator to attack but would not stand a chance against a flock of 10-25 or more birds.
If the saying is applied to humans, it is natural for people to be together if they have the same interests, hobbies, religions and perhaps professsions.
I have identified a few groups of birds that have flocking behaviour. Sometimes bird watchers will observe small flocks of songbirds flying together.
They are more than likely a group fo FINCHES.
CHICKADEES
fly in a follow the leader line rather than in a real flock.
LARKS, PIPITS STARLINGS ROBINS AND BLUEBIRDS FLY IN COHESIVE FLOCKS.
BLUEBIRDS ALSO FLOCK TOGETHER.
YELLOW RUMPED WARBER
SNOW HUNTING BIRDS.
MEADOW LARKS.
If you want to Identify birds that flock together
apply the following Look at the Landing sites, either on ground or treetops, and then the Flight calls, the noisiest are blackbirds and grackels.
GRACKLE
COWBIRDS are silent in flight.
So maybe a lesson to be learned is that together even humans can form protection against enemies and predators!
