The fish Kyle and Mike posted came from a relatively small river and as far as I know there is not a musky population in there. I do know that there are pike in there and ranging as far north as Austin, MN and further where the river is a mere stream or creek actually. I have also heard of the silver, or blue, pike but have not caught one myself. Personally I'll call it a pike. The only river that I know of this far south in Minnesota that might have muskies is the Zumbro or maybe, remotely maybe, even the Cannon River system and these flow to the mighty Miss. If I am not mistaken there are a couple lakes in north central and northwest Iowa that have a muskie population but neither have a watershed that would get muskies in the Cedar.
Another indicator that these are pike is the gill cover immediately behind the eyes. Both of these fish have scales on that portion of the gill flap. Muskies have no scales or just partially scaled where these are fully scaled.