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1. Sparkling reflections on puddles
2. Reflections on smooth metal
3. Chains that jiggle
4. Metal clanging or banging
5. High pitched noise
6. Air hissing - should be silenced with mufflers or piped outside
7. Air drafts blowing towards approaching animals
8. Clothing hung on the fence
9. Piece of plastic that is moving
10. Fan blade movement
11. Seeing people moving up ahead
12. Small object on the floor - such as a coffee cup
13. Changes in flooring and texture
14. Drain grate on the floor
15. Sudden changes in the color of equipment. Colors with high contrast are the worst
16. Race entrance is too dark. Animals will move from a darker place to a brighter place.
17. Bright light such as blinding sun. Animals will move from a darker place to a brighter place, but they will not move toward blinding light.
18. Animals may balk at one-way and back-up gates. Install them two to three body lengths away from the crowd pen. Equip one-way gates with a remote controlled rope so that they can be held open when the single file race is filled.

Any one of the items on this list may cause animals to stop moving and prevent a properly designed facility from working efficiently.