Zack Doyle

Well this is a pretty broad question, so I'll keep my answer close to home. In North America, terrain really determines how difficult an animal is to hunt. The reason pronghorns are so difficult to stalk, is because of the wide open flat plains they typical occupy. However, from a blind over a water hole, its relatively easy to kill one. They are spooky animals though. If I had to make an educated guess, I would say the the Coues Deer is probably the most difficult animal to get close to in North America. They have the wits and senses of a mature whitetail, only smaller, better camoflauged, and typically live in some pretty impenetrable places. I've not yet had the privilege to hunt one, but I've seen and heard about the hunts. Some of the sheep and goat species are also particularly difficult to get close to, also due to very extreme terrain. Many predator species, like coyotes, grey foxes, and bobcats are also difficult to approach. With senses like they have, its very difficult to get within range of these animals without the help of calls or dogs.

Matt Hoffpauir

Sasquatch. People have been hunting them for years without success.

Second hardest ... Probably mountain goats due to the locations they call home.

Thomas Farrell

I'm going to keep it simple and say the hardest animal to hunt is the elusive trophy whitetail buck. Sure, if you have excellent private property and practice QDM, then I would say you have an advantage. But like many others, if you hunt public land or even private land with a lot of pressure, only the best (or luckiest) will be successful.

Sheldon Lye

New Zealand Tahr, they live above 5000 feet in the most rugged, mountainous and snowbound terrain New Zealand has to offer, they are the holy grail of New Zealand hunting along with our famous Red Stags!!!