Some people find rats disgusting, but they are fascinating study subjects because of their unique status in the scientific community and laboratory environment. Rats aren’t just good at solving mazes. These little rodents also comprehend complex concepts. They understand when they’re being tested, and if they believe they are going to fail, some rats won’t even make an attempt. Natalia and Trace call up Dr. Kelly Lambert from the University of Richmond to learn more about the IQ of rats. Part of the "Animal IQ" series.