Top of the staircase

The gorilla at the top of the stairs.      Where did he come from?

Most kids who come in the museum love to get a snap of themselves with the monkey at the top of the stair, but he’s not a monkey! He’s a gorilla!
Originally made as a piece of public art by Peter Mountain,  it sat on the Middlesbrough train station steps on Sussex Street. And that’s it, all we know. Perhaps you have a snippet of information that you know about the Gorilla that we would be happy to hear.