My first encounter there were three. Two were whooping back and forth to each other. One was carrying a small juvenile. When I got growled at there were two. The one that I knew was there and caused to growl when I tried to force it to break cover and the one that flanked me and had got behind me. Some of the other stuff where they threw things could have been one since I think it likely that was an older juvenile having fun with me. Anyway in my experience, I would almost count on there being more than one at some encounter. You might see only one of them. Some mighty hunter that thinks he is tracking one and is going to get a good shot is likely to have one close behind him he is unaware of. Think Jurassic Park and velocoraptor attack. That is how I felt when the one behind me that I did not know was there, broke the tree off. If I had not backed off at the growl I might not be typing this.