Of all the pests that commonly infest properties, cockroaches are one of the most despised by people. Adding further credence to their repulsive reputation, a number of roach species have been show to practice cannibalism.
Some of the most common species have been observed cannibalistic characteristics, especially in famine conditions. Yuck! While this behavior might not be true in all 4,000+ species, it has been documented in german cockroaches and oriental cockroaches.
This unsightly characteristic could be one of the many reasons why cockroaches are such skilled survivors. One of the oldest creatures in existence, cockroaches date back before the dawn of the dinosaurs.