Many thanks for your participation. No more suspense, I give you the answers:
Picture tourist group 1: As you can see in the picture, there is a monkey lying on the ground with his head up. This is fingers. He is lying this way 80% of the time!
Picture green group: There are 2 monkeys in the bush. One head on the left, this is Simon asleep, and on the right, there is a one year old infant also asleep.
Picture tourist group 2: This is Chocobon! He is one of the most frustrating monkeys to follow when you need to get faecal samples. He can lay on the ground like this for hours!
Congratulations for your good answers and I hope you enjoyed the game.