Just like a ranger can track a criminal using scents, it would be nice if a hunter can use "animal scents" to track animals. Many times i got tired of roaming the forests aimlessly searching for deer or bears with no luck.
Have you ever seen a real life hunting ?...you don't walk clueless through the trees until you encounter some boar or fox...you search for fresh prints, chewed leaves, etc. You hunt SCENTS first, then you hunt the prey !.
It wouldn't be hard to implement this mechanic, just re-use the criminal-scent system and adapt it for animals. The scents could be "fox paw print", "boar poop", "deer hair" and the like (there could be even troll scents too !!!). Of course, the better EXP x PERC your hearthling has, the better he/she will be at tracking animals, and the better STEALTH the animal has, the more difficult will be to track it. Or we can use the animal's AGI in the equation: foxes are smaller and more agile than bears, so it would be harder to track a fox than a bear.
I've seen players not buying the "Ranger" skill (not everyone wants to be an HnH cop !!!); with this "animal scent" mechanic this type of players will have an encourage to purchase the skill and have a better HnH experience.
This can also be an opportunity to introduce more item to craft, like a "bunny whistle" to attract them to you or binoculars to increase your chance of getting more animal scents.
...this is just an opinion, critics and ideas are welcome !...