Per 
A group of 5571 instances
Item #: SCP-5571
Object Class: Euclid
Special Containment Procedures: Must be kept in a 20 by 20 foot box. There may not be any glass for observation next to the containment room. If entrance door is present there must be a chamber to prevent SCP-5571 instances from escaping.
Description: SCP-5571 is a colony of bats that have anomalous abilities. When encountered with a subject they release this pheromone that calls for other instances to move over to their location. Once in a group of at least 5 they all scream at once and release a supersonic screech. This screech is so deadly it will almost instantly shatter any glass or fragile like object along with instantly shattering the ear drums of anyone inside the room.
Addendum: All staff will rotate every two months for testing and counseling. If staff show any signs of hearing loss then they will be immediately transferred and put into testing to determine if their hearing is in fact damaged.
