Gibberling

Appearance
The first impression of gibberlings is of a writhing mass of fur and flesh. The pandemonium is actually a mass of pale, hunchbacked humanoids, with pointed ears, black manes and grinning faces. Their eyes are black, and shine with a maniacal gleam. Their fur is commonly infested with lice and other pests picked up during their burrowed slumber. Their hides are vile and worthless.

Combat
Gibberlings attack in great numbers, uttering ghastly howls, clicks, shrieks, and insane chattering noises. The screaming mob is completely disorganized in form, and random in direction. They usually carry short swords in their overly long arms. Where they get these swords is unknown, and they may instead wield crude weapons made from bone.
The horde's forward motion slows only long enough to kill anything moving, and then continues forward, their bloodlust apparently unabated. They always fight to the death. All food in their path is devoured, including the fallen among their own number, and any unfortified building or objects are generally wrecked.

Habitat and Society
It is difficult to imagine a gibberling social structure. Gibberlings require a prodigious amount of food to support their manic nocturnal existence, stripping to the bone anyone or anything that should fall in their path. It can be roughly compared to the social structure of a school of piranha in a feeding frenzy. There is no sense, no organization, and no individuality. Though they clearly have a primitive means of communicating among themselves, they have no discernible language.

Encountering a Gibberling
The only true hope of survival, should a herd of gibberlings be encountered, is to take strategic advantage of their fear of bright light. The gibberlings generally frequent only dense forests and Subterranean passages, loathing bright light of all kinds, and are particularly afraid of fire. If found during the day gibberlings awake, but generally cower in fear at the bright light surrounding them.

Gibberling Reproduction
Commonly, a brood gibberling gives birth to larvae called gibberslugs, which writhe beneath the skin of the brood gibberling. They are injected into the flesh of anyone the brood gibberling bites, including other gibberlings. The slugs then grow steadily and consume the body of their host from the inside, eventually bursting out through the skin. A brood gibberling can actually control those it has created, leading to the development of "clans" of the monsters.

Ecology
Attempts to find the gibberlings' lairs have inevitably led back to subterranean passages, where the trail is eventually lost in the deepest rock-floored recesses of the caverns. They can easily be tracked by the path of chaos and destruction they leave, and can be quickly dispatched while they lie dormant just beneath the surface of the ground. Gibberlings traveling above-ground invariably burrow into the ground to hide during the daytime, and it is at such time that they are most vulnerable. Subterranean gibberlings may burrow into the ground, or may simply lie down in a curled, fetal posture at times of rest. They awake suddenly, as a group, and burst in unison out of the ground, howling and gibbering in a most frightful way.

A special thanks to Wikipedia and to the makers of Dungeons and Dragons....

Unfortunately, there are no acceptable images of a gibberling that I could find...HELP ME OUT AND SEND ME A HIGH QUALITY PICTURE!