WATER VOLE In the Water Wild Animal Marsh Rodent Exhibit?  Postcard

This postcard has an image of a Water Vole as he is standing in a bit of muddy water surrounded by grasses.  A Marsh perhaps?  Is this an exhibit or is this an actual wildlife photograph?

ON THE BACK:  "Water Vole"

TYPE:  Chrome/ Standard
LOCATION:  United States
PUBLISHED / MARKED:  J. Salmon Ltd / Salmon Series Copyright / 5826

POSTMARK:  None, Not Mailed
STAMP: None
CONDITION: Unused with no writing, stamp or postmark.   The postcard has darkened or yellowed with age.  The corner points are a bit dull.

Will be shipped in a plastic sleeve.

EGNERAMA