Back in the 00s there was a Canadian nature show called The Nature Nut (hosted by John Acorn) that did an episode of dedicated to beavers. It featured a catchy kids tune Big Wet Rodent Day that got some internet attention back then… mostly in kids music circles- never mind what age I was. At some point people decided this celebratory day was July 26th and we’d celebrate the beavers, nutria, coypu, and alike every year.

Full Episode of the Nature Nut episode in question
Same episode, timestamped to the original song

With beavers large and muskrats small
We stop to celebrate them all
The glory of a beaver dam
That makes you say I am (that makes me say I am)
A big wet rodent fan.