Atractosteus spatula, the alligator gar (which actually has a head like a spatula), is the largest exclusively freshwater fish species in North America, and we have tons of these strange prehistoric-looking monsters of the shallows right here in the city. A slow float down the Trinity River through the Great Trinity Forest can turn up lots of these dinosaur-looking deals cruising with their broad backs just above the surface. They can grow to 10 feet and 300 pounds, so watch out when they slap water next to your canoe. The state will let you take one of them per day without a size limit, but you know what? Just looking at them and leaving them alone can be even more satisfying.