Answer:
Gaggle
Step-by-step explanation:
A group of geese that belong to different families is called a gaggle. A gaggle is a large group in which birds look out for each other. In such large groups one or two birds take the responsibility of looking after the predators while the other just arrange for food or feed on it.
Gaggle is a collection of geese on land , while they fly in sky in a group they are known as skein and when they fly very close to each other in a group, then the group is known as a plump