The other nine trackable hunter pets in Pandaria walk in predictable paths leaving footprints that eventually lead us to the beast making them. Originally all of their tracks were backwards, several have since been fixed when patch 5.1 went live. These beasts are completely stealthed, and the only thing that will make them visible is for them to walk through a flare. A Hunter's Mark placed on the beast will keep it visible to the hunter that placed the mark until the flare wears off.
Like the other nine beasts, Bombyx is stealthed and leaves tracks that can only be seen by hunters. His tracks however are unlike anything we've seen so far. He doesn't leave actual footprints as tracks, he instead leaves a trail of Heavily-Chewed Silkweed (pictured on the right in the screenshot below.) Unfortunately because these "tracks" are basically a small tuft of flowers (and look just like a smaller version of the Silkweed herb), they do not point in a particular direction. This makes determining the direction that Bombyx is travelling incredibly difficult.
As if not knowing which direction he were moving weren't difficult enough, he also moves VERY sporadically. He twists and turns, doubles back repeatedly and even stops in place for lengthy periods of time. In the screenshot below you can see there are Heavily-Chewed Silkweed tracks all over the place. Where does one even start looking for this guy?!

















