The people in the bus may well be reporters, because of the pictures, and I doubt they are students or scientists, as then they would respect the animals, but they could also be hunters because of their coldness towards the lions.
Sorry about how late I was (3 years!!!), but just trying to answer all I can
The main character is examining the deceased monkey looking for a cause of death and has found multiple blood rings on it's stomach and has narrowed the cause of death down to just two causes, Simian Fever or Ebola. Hope this helps!
