Form the Plural Form of the Noun: Deer

Answer : Deer are four-legged animals. Some nouns do not change ther forms when they are made plural. There are several terms in the English language that may be used interchangeably for single and plural nouns. 

Such examples include Sheep, programs, news, etc. These terms relate to both the single and plural versions of the noun, as appropriate. Deer is one such noun too. It is utilized according to both single and plural requirements.