Between 1988-91, Norway issued a "Nature" series of nine definitive stamps featuring nicely engraved and offset-printed, indigenous birds and mammals. Four of these stamps feature small mammals, two of which have not previously been shown on this thread.
The 2.60 kr. red fox stamp (Facit #1049) was issued on February 20, 1989, and the 4.50 kr. beaver stamp (Facit #1080)was issued on February 23, 1990.
Because of the third party hosting problem (Photobucket) on the earlier, aforementioned posting, I have edited this posting to show the 3.00 kr. ermine (Facit #1050) and 4.00 red squirrel (Facit #1051) stamps of February 20, 1991.