The technique of hunting with trained captive birds of prey is known as falconry. Instances of captive breeding are virtually unknown. Mating behaviour has been studied in captive individuals. Attacks by captive tigers are not that rare. Most of these parasites seldom lead to significant mortality among wild or captive elk. He covers his escape with an army of Invid mecha controlled by the captive Brain. Knowledge of social interactions is limited to information gathered from captive animals. Aggression among captive killer whales is common. To meet this demand a captive breeding industry has developed. No such conclusion that they are the offspring of Trojan captive women is warranted. This is claimed to be necessary because of difficulties with captive breeding. There was no significant difference in any of the characters between the two captive populations. This is documented in wild and captive chimpanzees. It concerns Tilikum, an orca held by SeaWorld and the controversy over captive killer whales. Study of captive specimens has found only males initiate copulation.