The title first got me worried but then guess I just learn new english words here today
And yet you opened it anyway!

English has a bunch of silly words for things that really don't actually need words, mostly because there are already words for it. In this example, usually a bunch of birds in one place is called a "flock" and, the idea of coming together and flying together is called "flocking."
Unless it is crows, in which case we call it a murder of crows instead of a flock of crows.
And, if it's geese, it's a gaggle of geese and not a flock of geese.
I don't know why crows and geese are singled out with their own words, especially when "flock" works just as well, but there you have it.
It's also not just common birds that get fancy terms, as seagulls, robins, pigeons, chickens etc are called flocks when they are together.
I makes no sense, but then a lot of English terms were written by noblemen who wanted to feel special so they probably invented terms to make themselves feel superior to others around them.

Def