What is the plural of moose?

The plural of "moose" is "moose". It's an irregular noun that doesn't follow the typical rules of adding "-s" or "-es" to form the plural. The word comes from Algonquian languages, and its plural form has been preserved. Therefore, both a single animal and a group of them are referred to as "moose". You can find more information about Irregular Nouns to understand how pluralization varies.