Yiks

 Yiks resemble baboon-sized arthropods, or larger, with chitinous exoskeletons. Hell, maybe they are actually arthropods. They look a like bugs with body armour and powerful mandibles. They don't spin webs and they don't tend to live in the dark, dank places that many types of giant spider favour (although there is nothing wrong with placing them there, if that's what you like), and they don't tend to be venomous, although of course there could be species or sub-species I don't know about. Greater Yik are the size of a 

They do, however, dwell in numbers, like clans, and they are intelligent. Clans can range in size from a dozen to fifty or so, perhaps even more, although they will be spaced out across their territory, and a party of adventurers are more likely to encounter a scouting party of 1-6 than large numbers. At least the first time. If an individual escapes such a confrontation, it will return with larger numbers. Usually as many again plus 1d8. 

And did I mention that they're smart? There is no doubt about this: yiks are clever in the way they go about engaging with those that enter their territory and cause harm to their kin. If they know where you are, they will consider their options before assaulting your position. If they charge headlong, in one unit, consider yourself lucky. This is a false charge: they intend for you to run away, preferably out of their territory altogether. The use this tactic mostly when intruders are still on the fringes of their hunting grounds and a direct exit is available. otherwise, if they con

They would prefer to steal supplies and equipment than to go toe-to-toe with an armoured fighter. But they set a trap if they can, lead you into traps built by others, or just steal all your rations while you're asleep. They will try to take advantage of wounded parties and even steal weapons, just to leave them less well equipped when the attack finally does come. 

Yiks don't bear humans (or any other race) any ill will. They're just trying to get by. But in the jungles and forests they tend to inhabit, there's a lot of competition for food. That said, if they can see an advantage in allying with a party of humans, they are capable of doing so. And just as capable for betraying them later.

Yik #2d3 AC 15 HD 3 Bite 1d8 Nat 19 Blade Trauma

Str14 Dex16 Con12 Int4 Perc12 Will10 Cha4 Luck5,

Climb Norm. 

Greater Yik #1d4 AC 16 HD 4 Bite 1d8+1 Nat 19 Blade Trauma

Str16 Dex16 Con14 Int6 Perc14 Will10 Cha4 Luck8, 

Climb Norm. 

Brood Mother Yik #1d2 AC 18 HD 8 Bite 2d6+2 Nat 19 Blade Trauma

Str18 Dex16 Con16 Int8 Perc16 Will15 Cha6 Luck10,

Climb Norm.