Taxonomic disappointment at its finest! That's a hippopotamus ( Hippopotamus amphibius ), which despite being semi-aquatic, is more closely related to whales than to other "river horses." The classic parent bait-and-switch maneuver hits different when it involves 3,000 pounds of territorial aggression instead of the sleek, echolocating Inia geoffrensis you were hoping for. Fun fact: hippos can't even swim—they push off the riverbed and "gallop" underwater. Budget dolphins indeed!