_Masiakasaurus_ was only 2m long, and has craniodental features (like procumbent front teeth) that suggest that it might have been a fish-eater. If correct, this in turn suggests that _Masiakasaurus_ habitually entered the water.
Well, no. It suggests that _its snout_ habitually entered the water. Like the spinosaurs, it may have been a heron analogue.