Detect when a mythicmob is moving?

I have created custom item models to get some custom mobs, which works great when they're fish.
Having giant sharks and anglerfish really spices up a pirate server.

However, on land they look rather stupid if they have a non-stop walking animation, or the reverse, when they walk and there's no animation.

So, is there a way to detect when a mob is moving, so I can animate him only when he moves?