Plastic brown horse from the experiment.
![](https://mb.cision.com/Public/30/2085375/8d083cee64c64ce2_800x800ar.jpg)
Photographer: Photo: Gabor Horvath
Dark horses suffer more from horse-flies than white horses. The study used plastic models in different colors. They were coated with glue where the bloodthirsty horse-flies got stuck.