Here's a Cree (English spelling...) story:
Wissaketchak was an old magician. A certain sea monster hated him and, when the old man was paddling his canoe, the monster lashed the sea with its tail, causing waves that flooded the land. Wissaketchak, though, built a great raft and gathered on it pairs of all animals and birds. The sea monster continued its exertions, and the water continued to rise, until even the highest mountain was covered. Wissaketchak sent a duck to dive for earth, but the duck could not reach the bottom and drowned. He then sent the muskrat, which, after a long time, returned with its throat full of slime. Wissaketchak moulded this slime into a disk and floated it on the water; it resembled a nest such as muskrats make on ice. The disk swelled, and Wissaketchak made it grow more by blowing on it. As it grew and hardened, he sent the animals onto it. It became the land we now inhabit.
(from
Flood Stories from Around the World)
A little similarity, yes. But how sure can we be that there was zero cross-contamination of the Cree story from 1500 AD by Christian missionaries' stories before this was collected? And why would Genesis
never mention muskrats?