Adding procedural variation to an animation
An easy way to get some animation variation over a group of entities would be to take advantage of the Crowd Ramp.
Here is how it works:
1/ Drag and drop a setBone behavior in parallel of your motion/locomotion behaviors
2/ Go inside the setBone Behavior's attributes. Click the Add a New Ramp button and create a small expression to drive the desired bone.
3/ Click the arrow button next to the ramp to go inside the ramp's attributes.
4/ Add some points to the curves to edit the value of the noise. For a static variation "disable "Ramp is Dynamic" option.
5/ Edit the output Max value to the desired maximum value (e.g 90°).
6/ Play your simulation.