An aggressive predator of the rivers, the needlemouth is a gar-like holost found throughout the streams and tributaries of the island. Needlemouths are swift and maneuverable, able to negotiate the leaf-chocked jungle streams in pursuit of their favored prey: smaller to medium-sized bony fish like Stink-fish (though they also jump to catch Swamp-wing). These impressive hunters are the sharks of the waterways. While many of the reptilian river carnivores are ambush predators, needlemouths chase down their fast-moving prey, matching their speed and turns in flat-out races.
Groups of 3-9 Needlemouths chased down their fast-moving prey, reaching a top speed of 31-56mph and able to sustain such speeds for relatively long periods of time.
They themselves can become prey to killer-eels.