Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
What has 13 hearts but no other organs?
Of the king I am blue and of the peasant I am red. Of the frog I am cold and of the dog I am hot instead. What am I?
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
Tear me off and scratch my head what once red is now black.
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?