In the phrase herd of elephants, the word herd is a collective noun.
What is a collection of elephants?
A group of elephants is called a herd or parade.
Is the flock a collective noun?
A herd is a collective noun that refers to a group of different animals such as sheep, deer, and elephants.
Is the elephant herd singular or plural?
An elephant. A herd contains multiple elephants, but it is singular because it refers to one herd.