Hippopotamus
CREATURE 5Typical adult hippos move quickly on land and attack stealthily in the water.
Hippopotamuses, or hippos for short, are semiaquatic animals that spend most of their time in rivers and lakes, but can thrive on land.
The hippopotamus can hold its breath for 5 minutes.
30 feet
The hippopotamus tries to capsize an adjacent aquatic vessel of its size or smaller. The hippopotamus must succeed at an Athletics check with a DC of 25 (reduced by 5 for each size smaller the vessel is than the hippo) or the pilot's Sailing Lore DC, whichever is higher.
Medium or smaller, foot, DC 22 basic Reflex
The monster Strides up to double its Speed and can move through the spaces of creatures of the listed size, Trampling each creature whose space it enters. The monster can attempt to Trample the same creature only once in a single use of Trample. The monster deals the damage of the listed Strike, but trampled creatures can attempt a basic Reflex save at the listed DC (no damage on a critical success, half damage on a success, double damage on a critical failure).