![]() Infrasounds are low-pitched sounds like those that come from a bass or sub-woofer audio speaker. However, many animals communicate well below 20 hertz, which is called infrasound. Humans can hear frequencies (pitch) from 20 hertz to 20,000 hertz (cycles per second). Previously, tiger vocalizations had been recorded and studied by scientists only within the human hearing range. ![]() Several of these vocalizations can be heard from some distance, and tiger roars can be heard several miles away. Tigers are quite articulate and have a wide variety of vocalizations, such as chuffing, which is a type of affectionate greeting, growling, hissing, grunting, roaring and mewling, which is only used by cubs and courting tigers. Vocalizations, however, constitute the tiger's main means of communication. Tigers use scent (pheromone) communication by clawing trees and spraying urine to mark their territory, which can be many square miles in size. To understand more about tiger behavior it is necessary to study their communication. There is estimated to be between 2800-4700 Bengal tigers in the wild, with 333 in captivity. ![]() The Bengal tiger resides in India, and is smaller than the Siberian. The Siberian tiger has been reduced in numbers to approximately 150-200 in the wild, and 490 in captivity. The Siberian tiger, which lives primarily in Russia and parts of China, can weigh up to 750 pounds and measure over 9 feet in length. In an effort to save the remaining four sub-species, scientists are furiously studying tiger behavior. Within the past 70 years, 3 sub-species of tiger, the Bali, Javan, and Caspian, have become extinct. Once broadly distributed over most of the continent of Asia, the tiger has lost its place in the wild due to poaching and habitat loss. The magnificent noble tiger, revered throughout human history, is now endangered. Presented Wednesday Morning, December 6, 2000ĪSA/NOISE-CON 2000 Meeting, Newport Beach, CA Low Frequency and Infrasonic Vocalizations From TigersĮlizabeth von Muggenthaler - 91, Communications Research Institute ![]()
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