How do you know that Lewis Carroll's "The Walrus and the Carpenter" is a narrative poem?

Answer :

“'The Walrus and the Carpenter' is a narrative poem famous for the themes of death and betrayal. It was first published in 1865. This poem speaks about a Walrus and a Carpenter who trick innocent young oysters and eat them after a walk on the seashore. The poem also deals with the idea of cunningness in human nature”

For more information, visit the source: https://literarydevices.net/the-walrus-and-the-carpenter/