I am a member of the Alaska Wildlife Conservation Center. It allows me to visit the center throughout the year by just showing my membership card. I love checking on the animals and this is a great time of year to watch them. The summer brings lots of guests, in the winter and spring it is not uncommon for me to be the only one there.
You can find a variety of animals at the center including moose.
Caribou can also be found.
Muskox
Elk
Bison
There is even an eagle...although last 2 times I was there an owl was in the eagle cage.
My favorite, by far, are the brown bears. They are a blast to observe and when there are active make great photo subjects.
If you find yourself in the Portage area, you owe it to yourself to stop in to check out the wildlife. The center's website is: http://www.awcc.org/home.html
Mike