Worker Ant, Giant
A thin, six-legged ant the size of a pony stands at the ready, its mandibles chittering and its stinger dripping with venom.

Giant Worker Ant (CR 1; XP 400)
N Medium vermin
Init +0; Senses darkvision 60 ft., scent; Perception +5
Defense
AC 15, touch 10, flat-footed 15
(+5 natural)
hp 18 (2d8+9)
Fort +6, Ref +0, Will +1
Immune mind-affecting effects
Offense
Speed 50 ft., climb 20 ft.
Melee bite +3 (1d6+2), sting +3 (1d4+2)
Statistics
Str 14, Dex 10, Con 17, Int —, Wis 13, Cha 11
Base Atk +1; CMB +3; CMD 13 (21 vs. trip)
Feats ToughnessB
Skills Climb +10, Perception +5, Survival +5; Racial Modifiers +4 Perception, +4 Survival
Ecology
Environment any
Organization solitary, pair, gang (3–6), or hive (7–18 plus 10–100 workers, 2–8 drones, and 1 queen)
Treasure none

Giant ants are as industrious as their normal-sized kin. While their nests generally don't consist of thousands, their greatly increased size more than compensates.