The real threat comes from a second type, distinguished by their furry appearance*.
*While scientists debate whether this is fur as we know it or iron filings, such questions can only be answered when we are fortunate - or unfortunate - enough to examine one closely. Note: until we have more details, the exterior will be described as "furry".
There are two forms of these larger, darker creatures. One looks like a cross between a raccoon and a bear, with dark "fur" and large, rather morose, yellow eyes. Several of our field staff have witnessed it roughing up MoleRats and Tripods, and even stalking Bulge. These attempts have been rebuffed by the frantic efforts of the apparently lower-ranking MoleRats and Tripods. Such attacks have led us to label the attackers "Guidos".
Late-breaking news: One of these Guidos has been captured, affording our research team an invaluable opportunity for close study. To our surprise, this individual, which was caught while bitch-slapping a pair of Tripods, was quite docile when held - see illustration, below.
Unfortunately it escaped just after this picture was taken, but we were able to definitely determine that it is not covered in iron (or any other metal) filings. Lab results on the "hairs" left behind may give us valuable information about this bully from scientific-inquiry-wants to-know-where. Clearly its passivity was a ploy to lull its captor into inattention, thus enabling its escape.
Speculation is that it has rejoined its brethren or gone back to report to the creature we feel certain is directing all Guidos. This most monstrous being seems to be covered in similar "fur", but has none of the dull stupidity of the Guidos. On the contrary, the one which has been sighted by our field staff is uniformly described as eerily malevolent and menacing. All indications are that it is worshipped by Guidos, Tripods, MoleRats and the Bulge alike. That this adulation is based in fear and oppression cannot be questioned. We feel it our duty as persons of conscience to warn humanity and mobilize the necessary force to crush this threat to all we hold dear.
If the evidence thus far reported does not suffice, consider the single extant photo, and experience the dark aura of . . . Zygadenus!