Nervous system
The organ system that receives stimuli and transmits signals to coordinate an animal's responses and behavior. It is divided into the central nervous system, made up of the brain and spinal cord, and the peripheral nervous system spread throughout the body.
Through selective breeding, humans created roller pigeons that do somersaults mid-flight. The 'Parlor Roller' can't fly at all — it just rolls backward on the ground. Fans see it as fun, but scientists call it a nervous system disorder.
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