![]() One theory is that the trance is caused by fear, which is probably a defensive mechanism intended to feign death, albeit rather poorly. If the chicken is hypnotized in this manner, it will remain immobile for somewhere between 15 seconds and 30 minutes, continuing to stare at the line. Chicken hypnotism EditĪ chicken can be "hypnotized", or put into a trance, by holding its head down against the ground, and drawing a line along the ground with a stick or a finger, starting at the beak and extending straight outward in front of the chicken. In this case, the orcas turn themselves upside down before attacking, trap the stingrays in their mouths, then quickly right themselves, in turn flipping the stingray over, inducing the tonic immobility, rendering the fish helpless and an easy meal. Another case of orcas purposely inducing tonic immobility in fish has been seen with stingrays in New Zealand. This was the first recorded eye witness case of predation on a great white shark in the wild by a species other than humans. It kept the shark still for fifteen minutes, causing it to suffocate to death. In an interesting eye witness case off the coast of California, a female orca was seen holding the shark upside down to induce tonic immobility. Great White Sharks are not so responsive as other species when tonic immobility has been attempted. During tonic immobility, the dorsal fin(s) straighten, and both breathing and muscle contractions become more steady and relaxed. Scientists believe that tonic immobility in sharks may be related to mating, because female sharks seem more responsive than males. With tiger sharks (measuring 3–4 metres, or 10–15 feet, in length), tonic immobility may be achieved by placing hands lightly on the sides of the animal's snout in the area surrounding its eyes. ![]() Some sharks go into tonic immobility when they are turned upside down. Scientists have exploited this phenomenon to study shark behaviour. ![]() The shark remains in this state of paralysis for an average of fifteen minutes before it recovers. Some sharks can be placed in a tonic state.
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