Did Tsu'tey See Neytiri and Jake Sleeping Together?
 

At the beginning of the bulldozer scene, we see Jake and Neytiri together. After Jake bashes the camera on the bulldozer we see Tsutey and his band at a distance observing whats happening. Is it possible that Tsu'tey saw both of them together? He did happen to be within the very same proximity when the bulldozer arrived.

Now I've heard the other reasons why Tsu'tey knew (or had a hunch) that Neytiri and Jake mated and I think that they are all valid; however, is there more to it then what we see in the film?

I think that judging by how he actually stops when eh reaches the area, he only got there.

He could tell form Jake and Neytiri holding hands (and the morning after hair :P )
I also read one fanfic which is non-canon but a nice touch where when two Na'vi mate, part of their bioluminescent markings will change to match each other's