Oxalaia
The cone-shaped teeth of Oxalaia were built for impaling prey, instead of cutting flesh like those of most theropod dinosaurs. Oxalaia's nostrils were placed far back on the head. This was probably to avoid water getting inside its nostrils when fishing. Both of these features were unique to spinosaurid dinosaurs, and were useful for catching and feeding on fish. The spoon-shaped front jaws and piercing teeth of spinosaurs worked as an efficient fish trap. This trait is also seen in the Indian gharial—the most fish-eating of modern crocodilians.