It depends on how you are going to do wildlife photography. I am no professional. I do however, like to focus on wildlife during my summer months for my own enjoyment. It gets me out there to enjoy all that nature has to offer. That and I like the challenges.
When the snow melts, I usually like to take hikes and walk around. I will always take my camera with me. Because I don't wait patiently in one spot all the time, I do not use tripods or monopods. I do however use a Bushhawk shoulder mount. My lens of choice is a 50-500mm Bigma. It is perfect for its versatility. Because I move about, I need all the reach I can get, so most of the time, I am shooting at 500mm. Quite a few times, though, the 50mm has come in handy. I don't camouflage myself, preferring to wear blaze orange just in case you get mistaken for a deer, bear, or moose during hunting season (but only if I go into the forest and at certain times of the year…majority of my work is in local parks where it is safer).
Here is a photo of my wildlife rig.
Here are three examples using the above equipment. Yes I know, that is a Canon camera.
This little guy decided to run across my path. He didn't stop long. I would not have gotten him if I was tied to a tripod or even a monopod.
I had to go into the prone position to get this shot.
One more example. This female red wing wouldn't let me get close. So I did appreciate all the reach I could get.