Ant Lion (CR 5)

Large Vermin
Alignment: Always neutral
Initiative: -1 (Dex); Senses: Listen +7 and Spot +7

AC: 18 (-1 size, -1 Dex, +10 natural), touch 8, flat-footed 18
Hit Dice: 8d8+8 (44 hp)
Fort +7, Ref +1, Will +3
Speed: 30 ft., burrow 10 ft.
Space: 5 ft./5 ft.
Base Attack +6; Grapple +5
Attack: Bite +8 melee
Full Attack: Bite +8 melee
Damage: Bite 2d8+4
Special Attacks/Actions: Improved grab, tear
Abilities: Str 16, Dex 9, Con 13, Int -, Wis 13, Cha 11
Special Qualities: Vermin
Feats: -
Skills: Listen +7 and Spot +7
Advancement: 9-12 HD (Large); 13-24 HD (Huge)
Climate/Terrain: Temperate and warm desert, forest, hill, plains, and underground
Organization: Solitary or nest (mated pair and 1-4 noncombatant young)
Treasure: 1/10 coins; 50% goods; 50% items

Source: Converted

The ant lion is a huge, vicious insect that lurks at the bottom of deep pits, feeding on creatures unlucky enough to fall in.

The ant lion resembles a cross between a mole and a giant ant. Its body, gray or sandy brown in color, is covered completely by a leathery exoskeleton with patches of coarse black bristles that are sensitive to movement and odor. It has deep-set beady eyes, rows of jagged teeth capable of both tearing and grinding, and six thick legs with sharp claws and flat bristles. The claws are used for digging while the bristles sweep away the loose soil. The ant lion's most prominent features are its mandibles, silvery gray and razor-edged, extending three feet from its mouth. A single barb centered on the inner ridge of each mandible is used to impale and hold prey.