Heroes 6 - Discussion

Hmm... interesting, who is this mysterious unit?

I think this isn't a unit, but rather a possible action a hero/army can perform on the map, something like a digging command, where instead of a horse, you see a shovel...
I can also assume that this is some kind of bonus for increasing speed, if you approach it (meaning you can travel further on the map during the day), because in many ancient symbolisms, a rabbit represents speed...