Monstrous Spider, Medium (CR 1)

Medium Vermin
Alignment: Always Neutral
Initiative: +3 (Dex); Senses: darkvision 60 ft., tremorsense 60 ft., and Spot +4*


AC: 14 (+3 Dex, +1 natural), touch 13, flat-footed 11
Hit Dice: 2d8+2 (11 hp)
Fort +4, Ref +3, Will +0
Speed: 30 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple +1
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d6 and poison
Special Attacks/Actions: Poison, web
Abilities: Str 11, Dex 17, Con 12, Int -, Wis 10, Cha 2
Special Qualities: Vermin
Feats: Weapon Finesse (bite)
Skills: Climb +11, Hide +7*, Jump +0*, and Spot +4*
Advancement: 3 HD (Medium-size)
Climate/Terrain: Temperate forest
Organization: Solitary or colony (2-5)
Treasure: 1/10 coins, 50% goods, 50% items

Source: Monster Manual

All monstrous spiders are aggressive predators.

Monstrous spiders come in two general types; hunters and web-spinners. Hunters rove about, while web spinners usually attempt to trap prey. Hunting spiders are speedier than their web-spinning counterparts and use higher speed numbers shown in parentheses.

Monstrous spiders of both types have roughly circular bodies surrounded by outspread legs: 5 feet wide* and 6 inches high.
*The number includes the spider's body and its legs; the actual body diameter is about a third of the total.