As she spoke, she saw a ripple in the water, larger than the one she had remarked upon the day before. She stared curiously at it, and then saw three more a few yards away. And a moment later she saw something else.
“There are no more River Horses in these parts, right?” she said.
“That is right,” answered Omar.
“That’s what I thought.”
Suddenly she drew her Black Demons and in less than two seconds had fired twenty quick shots into the water, which soon turned red with blood. Four bodies, each wearing a wet suit, an aqualung, and with a trident gun slung over one shoulder, slowly floated to the surface.
“All praises to Wilkes and Hawkins,” she said. “Who else could give me .32 caliber bullets that go straight and true through five feet of water?”
“Who are they?” asked Hassam, staring at the bodies.
“River Rats,” said Lara, holstering her weapons. “A suddenly-extinct species.”

The Amulet of Power, Chapter 12