I don't think these tigers are fighting. Their body language does not look like it contains any form of aggression. Plus, they both have a very similar shade of orange and similar markings. I'm pretty certain that the two are related and are simply engaging in play.

Play-fighting then, jeez. Notice I didn't specify if it was fight or play-fighting, cripes.

Lol why are you getting so defensive? I could have been a lot worse. By looking through your other picture and the comments you have made you clearly know very little about tigers, yet you speak as if what you are saying is fact. Very misleading for anyone looking in, so I thought I would politely correct one of your captions. Like I said, I could have been a lot worse...jinkies.