These moose shots were taken a few months back during my trip to Grand Teton National Park.
According to park rules, you are allowed to be within 25 yards of any animal that isn't a bear or wolf. These moose are gigantic animals. They look really docile, but I'm guessing if they get pissed, I don't want to be 25 yards away. Their legs are as long as my body, so I'm guessing I can't outrun them...plus, I'm fat..so there is that.
I would guess we were about 30-40 yards from this guy. He was in a river valley and we were standing above him looking down. Using a lens like the Tamron 150-600mm Lens and getting as low of a perspective as I could enabled me to get a shot that looks like I was looking directly in his eyes. One of the best things you can do to improve your wildlife photography is to get eye level with your subject. It connects the viewer to the critter in the image and is simply more dramatic.
This guy was getting his antlers and they are in velvet. He had a few battle scars on his face, too. You can see those in this profile shot below.
If you hover your mouse over the images, it will show you my camera settings for these shots. You'll notice I was at ISO 1250. Anytime I am shooting wildlife, I usually start at ISO 800 and go up if I need to increase my shutter speed. Since these critters move, I like to keep a fairly "quick" shutter speed.
This is in stark contrast to the landscape & scenic images I post, where I want the ISO as low as I can get it. Doing this type of wildlife photography the shutter speed is more important than the ISO, and even digital cameras a few years old have no problems shooting ISOs up to 1600.
These images were made with my Sony A77ii and Tamron 150-600mm Lens.