SCP-098, also known as “Surgeon Crabs” is a collection of a few instances of a species of animal which is biologically impossible, contained by the fictional SCP Foundation.

They look like most crabs except they have little knife-like structures on their front two appendages. These crabs pack hunt and use their knife-like appendages to cut the tendons of their prey. In addition to this, these crabs can vocalize, which is used to disorient prey.

For a more in-depth explanation of this entry, follow this link to read the original article: https://scp-wiki.wikidot.com/scp-098