A group of penguins can be called by different names depending on their location and activity. The most common collective nouns for a group of penguins are colonies, rookeries, or huddles, and these terms are used to describe groups of penguins on land. When penguins are swimming, they are called a raft, and when they are walking, they are called a waddle. Other terms that can describe a group of penguins include muster, parcel, shiver, town, pride, tobogganing, and formality.