What is the Difference Between a “Flock” and a “Gaggle” of Geese and How Did the Terms Originate?

Any group of birds, goats, or sheep can be referred to as a flock, but each feathered breed has its own proper title.

Hawks travel in casts, while it’s a bevy of quail, a host of sparrows, and a covey of partridges.

Swans move in herds, and peacocks in musters, while a flock of herons is called a siege.

A group of geese is properly called a gaggle, but only when they’re on the ground.

In the air they are a skein.