Bee mystery

It was warm today. I checked the bees and found them flying about in the sun. But later today, when the sun disappeared behind the clouds and the temperature dropped, I went out to see if they had all gone back in. When I got to the hives, I saw the strangest thing! There were no bees flying around, but I noticed many little holes in the snow just in front of the hives. When I looked more closely, each one was about 1 inch or so deep, and each had a bee at the bottom! Why on earth had that happened? Did they land on the snow and get too cold to fly away, and then the snow melted them down into it? How awful!

 Coyote tracks on the way to the bee hives.

Coyote tracks on the way to the bee hives.

 Each one of these holes in the snow has a bee at the bottom.

Each one of these holes in the snow has a bee at the bottom.

 Dead bee at bottom of tunnel.

Dead bee at bottom of tunnel.