The Burgess Animal Book For Children in "Spite The Marten And Pekan The Fisher"

One is called Spite the Marten and the other Pekan the Fisher.

"Spite the Marten is also called the Pine Marten and the American Sable, and he is one of the handsomest members of the Weasel family.
Shadow the Weasel can climb, but he spends most of his time on the ground. Jimmy Skunk and Digger the Badger are not climbers at all.
Little Joe Otter spends most of his time in the water.