Et al in the bibligraphy- CSL editor

I have tried to find a good thread on this as it appears many, many people have had similar problems but have had no luck. I CANNOT get the "et al" to work in my bibliography. In the CSL editor, no matter what I try it will not show up in the example citations- it either shows just a few authors or all of them, never with an "et al." What am I supposed to do? Here is my style link: http://csl.mendeley.com/styles/115759941/animalbehavioretal