From publisher blurb: This bonus bit of content is a description of a new "monster" that was the initial inspiration for the Tweak & Toss "mission" The Invasive Invertebrates. This creature, while technically a monster, isn't intended to be a serious challenge to any party, but instead just a bit of background on an obscure creature that can inhabit your game world. Hopefully the Carniverous Clam can be and interesting new creature for your campaign.