They were... disgusting.

SCP-682 is a large, vaguely reptile-like creature with immense potent regenerative and adaptive abilities. One of the most infamous SCPs known to the Foundation, SCP-682 is impossible to kill. SCP-682 has a hatred of all life due to viewing them as humans view cockroaches and suffering their torture for decades. It expresses extreme horror at humanoid life and will attempt to kill most humanoids on sight.