Well, nature & evolution is dynamic. Yep, it is getting warmer - to that I can attest after 50 years of living in Ak, the first 20yrs full time in the Arctic. I return each Aug/Sept to our headquarters site located 155GPS miles north of the Arctic Circle.  I know that section of the Nimiuktuk well. 
I have noticed an increase Northern 3-toed Woodpeckers. Saw only 2 from 1967 through 2000, both in Dec.  Then I found "pecker holes" all over my plywood lodge. I figured the peckers were at work during the winter, but In 2014 one pestered me as it returned repeatedly to beak-drill on my place as I stained the outside, for 3 days in mid-September. 
After patching the holes in 2014, in 2016 I again had 3 big holes, but did not sight the perpetrator.