A flock, herd or mob
You just answered it yourself... You call 'em a flock...
There is no "father" with birds or in a flock of birds.
A Flock
"There is no special name for a flock of flamingos; the group is called a flock." Its called a pat of flamingos!
A group of sheep are a "herd".
Congress.
flock
Flock
Flock
a flock
A flock of chickens