Blacktail Deer Plateau I can explain

Grayday was a bit late arriving, having had to navigate through the trees in order to reach his newly-returned packmates. He was overjoyed to have them all home, and when he reached them, the male made ample show of coating them all thoroughly with his scent. (This was achieved, of course, through much licking and nuzzling and dadding.)

"You were gone so long!" he complained, pretending to examine his son. "I hardly recognize you! Why, I'm sure you were a nice pale blue before you left, and now you've gone and turned completely invisible!"

This remark was meant humorously, but in all honesty, Grayday was shocked by the size his youngest son had achieved in his time away. What had Pema been feeding him?