Groups of birds are refered to in differn't ways depending on what kind they are. Geese are a "Gaggle" when on the ground and a "Skein" when in flight. Magpies, A "Tiding", "Gulp" or"Charm". Nightingales, A "Watch"... the list goes on and on Crows are for whatever reason refered to as a "Murder" when in groups. Who would have known?