Warning: This was taken with the Panasonic GX7 and 100-300 lens!
there are two good reasons:
1) The E-M1 was not available, so this was the only micro 4/3 possibility.
2) The Panasonic forum is just about dead.
So, I hope it is okay to post this here.
I thought it was a blast, since the squirrel seemed to be sneaking up on the hawk until the hawk looked his way. (The 100mm at the wide end barely allowed me to get both in the same frame. I was in the doorway of the house and couldn't zoom out with my feet.)