Wasgij 1000 pc Puzzle - Original No. 31 - Safari Surprise

This is the hilariously funny 1,000 piece jigsaw puzzle that shows a wild safari tour. The image printed on the front of the box depicts the tour stopping to catch a glimpse of the wildlife around. However something has caught the eye of the people, causing them to double-take. Try to imagine you are the tour guide and piece together what he can see. What could be happening to get this surprised reaction from everyone?