Why can a chicken run for a while after its head is cut off?
A chicken can run for a while after its head is cut off because the brain and the body of the chicken are not completely dependent on each other for movement. Even though the chicken's head has been severed, some of the reflexes in the spinal cord can still function for a brief period of time. The reflexes allow the chicken's legs to continue moving even though the chicken is no longer conscious. This phenomenon is known as the running chicken syndrome or headless chicken phenomenon. However, it is important to note that this is not a conscious or deliberate movement on the part of the chicken and the animal is not alive without its head.
Does this happen to other species too?
Yes, the phenomenon of movement after decapitation is not unique to chickens and has been observed in other animals as well. For example, it has been reported in turkeys, ducks, and even some insects like cockroaches. Similar to chickens, these animals can exhibit reflexive movements for a brief period after decapitation due to the activity of the spinal cord and nerves. However, the duration and extent of movement can vary depending on the species and circumstances, and it is important to note that the animal is not conscious or alive without its head.

During the French Revolution, there was an infamous case of a man named Languille who was executed by guillotine. According to some reports, after his head was severed, Languille's eyes and mouth reportedly continued to move for a few moments before he was declared dead. However, it is important to note that the accuracy of these reports is disputed, and there is no conclusive scientific evidence to support the claim that humans can exhibit movement after decapitation. Nonetheless, the case of Languille remains a notable example of the longstanding fascination with the possibility of post-decapitation consciousness and movement.