Thorin seemed surprised that the large man had heard of the pale orc. "You know of Azog? How?" 
"My people were the first to live in the mountains. Before the orcs came down from the north." Beorn explained as he walked up and down the length of the room. "The Defiler killed most of my family, but some he enslaved. Not for work, you understand, but for sport. Caging skinchangers and torturing them seemed to...amuse him." his voice was low, growling, he clearly had no love for the orcs either.

Kili had been about to ask Beorn a question but he stopped as the skinchanger mentioned slavery, suddenly noticing the large iron shackle that was still clamped around his right wrist. The chain had long since broken off. The young dwarf looked down sadly, and busied himself with eating the bread and cheese Beorn had served to them.

"There are others like you?" Bilbo asked as he looked at him curiously.
"Once there were many." Beorn smiled sadly.
"And now?"
"Now, there is only one." he finished. Clearly he meant himself.