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A donkey near the top, behind the people.
A donkey on the left, behind the group.
A donkey partially visible on the left edge.
A large donkey in the center-left.
A donkey in the center-right.
Another donkey near the right edge.
A donkey in the lower left.
One last donkey, partially visible, in the lower left.
Final answer: 8 donkeys!
If you only saw 5 or 6 at first glance, don’t worry: that’s precisely the point of these kinds of challenges. Illusions and visual tests push the normal limits of our perception and attention.
And you, how many did you find before seeing the solution?
Tag a friend who thinks they’re super observant and challenge them! 
Note: The number “8” corresponds to the number of donkeys seen in the image; I cannot confirm that this is the number the creator of the image intended.