Traditionally all the images are taken in the 12 months since the last calendar was created. 
However, this year I included 2 photos from the previous year - so that I could include a couple of UK subjects (no UK trip in 2015).
At least a few images share some kind of theme:  "Bath time" for two months.  "Confusing names" for three months. Robins and Blackbirds - the American Robin is closely related to the European Blackbird. The sparrow-sized Robin is not related to the American Robin - got it? 
January - Northern Harrier (female)
January - Northern Harrier (female)
February - Varied Thrush (male)
February - Varied Thrush (male)
March - Robin
March - Robin
April - Pileated Woodpecker and Northern Flicker (females)
April - Pileated Woodpecker and Northern Flicker (females)
May - Common Merganser family
May - Common Merganser family
June - American Robin (juvenile)
June - American Robin (juvenile)
July - Barred Owl (juvenile)
July - Barred Owl (juvenile)
August - Blackbird (male)
August - Blackbird (male)
September - American Goldfinch (male)
September - American Goldfinch (male)
October - Northern Shrike
October - Northern Shrike
November - Surf Scoter and Long-tailed Duck (males)
November - Surf Scoter and Long-tailed Duck (males)
December - Bald Eagle pair
December - Bald Eagle pair