Prusten

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A pair of clouded leopards, one of the four felid species that use prusten to communicate. Photobomb Level- Clouded Leopard NashvilleZoo.jpg
A pair of clouded leopards, one of the four felid species that use prusten to communicate.

Prusten is a form of communicative behaviour exhibited by some members of the family Felidae. [1] Prusten is also referred to as chuffing or chuffle (verb and noun). [2] It is described as a short, low intensity, non-threatening vocalization. [1] In order to vocalize a chuff, the animal's mouth is closed and air is blown through the nostrils, producing a breathy snort. [3] It is typically accompanied by a head bobbing movement. [1] It is often used between two cats as a greeting, during courtship, or by a mother comforting her cubs. [1] The vocalization is produced by tigers, jaguars, snow leopards, clouded leopards and even polar bears. [1] Prusten has significance in both the fields of evolution [1] and conservation. [3]

Contents

Mechanism

In tigers, it has been found that low-pitched vocalizations, such as prusten, originate from vibrations of thick vocal folds in the larynx of the cat. [4] Sound production is facilitated by the low threshold pressure required to oscillate the vocal folds, and low glottal resistance. [4] The rough-sounding quality of the low-pitched vocalizations is likely generated by the complex pattern of vocal vibrations, caused by the excitation of multiple modes of oscillation simultaneously. [4] Prusten also involves air being exhaled through the nose at the same time as through the mouth. [3] This may represent an evolutionary shift from exclusively laryngeal vocalizations to mixed nasal and laryngeal sound production in the felid species that display the behaviour. [1]

Sound properties

Phonetically, prusten varies by species, [5] however the basic structural pattern remains constant. [1] More structural similarities occur between the two leopard species, and also between the tiger and jaguar. [5] Individual sound pulses are more separated in the leopards in comparison to the other species, in which they tend to be more closely merged. [1] Pulses may occur in pairs, in which a basal pulse and an upper-range pulse are produced simultaneously. [1] This may reflect both laryngeal and nasal contributions to the vocalization, with the upper-frequency pulses produced nasally prevailing in tigers and jaguars. [1]

The vocalization is produced by repeated, short pulses of air through the nose and mouth, each lasting an average of 0.37 seconds at an average frequency of 248 Hertz in tigers. [3] Frequency compositions are similar throughout the four felid species, however they differ in intensity of low-frequency components. [1] Total numbers of pulses produced per vocalization shows individual variation, [3] but tend to fall in the range of 4-10 for all four species. [1] Studies on tigers have shown that acoustic energy peaks in the low frequency range and the power wanes in higher frequencies, as in many tiger vocalizations, yet a distinct pattern allows prusten to be distinguished. [6]

It has been found that tigers are most sensitive to lower frequencies and are likely able to hear in the infrasonic range, which is likely reflected in the production of calls such as prusten. [6] It has also been hypothesized that hearing in the low frequency range is beneficial in communicating and locating prey in the low-visibility jungle habitats where these cats usually live. [7]

Purpose

A tiger with her cubs; a scenario in which prusten may be expressed. Bhairavi with Cubs (Unsplash).jpg
A tiger with her cubs; a scenario in which prusten may be expressed.

Prusten is social in nature, [8] and may be produced for a variety of purposes. In captive tigers, it is more likely to be expressed when the animals are housed in groups rather than individually. [8] Cats may produce the vocalization both to each other in greeting, or to familiar people such as zookeepers, as seen in clouded leopards. [9] It is used to signal friendly intent to the other animal, and is generally reciprocated by other felids. [1] It may also signify happiness, as content leopards tend to be more vocal and produce prusten more frequently. [9]

In the clouded leopard and tiger, it has been observed that females often express this vocalization during estrous. [10] This has also been noted in snow leopards, and is on occasion used by females to initiate mating with a male. [11] It is frequently used by felid mothers when returning to her den in greeting to her cubs, and the cubs begin to produce this vocalization at around 5 weeks in snow leopards. [11]

Significance

This vocalization is distinct from friendly and non-threatening vocalizations produced by other felids, and thus has been described as a behavioural apomorphy. [5] This distinction has been useful in determining evolutionary relationships between members of the family Felidae. [1]

Prusten may be able to serve as an indication of well-being. [8] It is also valuable for conservation purposes, along with other unique felid vocalizations, and may enable the location and monitoring of both individuals and populations in their habitats. [3] Ongoing studies seek to determine if there are individual differences in the acoustic pattern of tiger vocalizations that would aid in monitoring and conservation practices. [6] This hypothesis is the basis of The Prusten Project, which analyses individual tiger calls with the goal of developing and implementing non-invasive monitoring systems as a conservation tool. [12]

In non-felids

Chuffing has also been recorded in polar bears. Unlike in cats, polar bears do not chuff through the nostrils but through a partially open mouth. [13]

See also

Related Research Articles

<span class="mw-page-title-main">Felidae</span> Family of mammals

Felidae is the family of mammals in the order Carnivora colloquially referred to as cats. A member of this family is also called a felid. The term "cat" refers both to felids in general and specifically to the domestic cat.

<span class="mw-page-title-main">Jaguar</span> Large cat native to the Americas

The jaguar is a large cat species and the only living member of the genus Panthera native to the Americas. With a body length of up to 1.85 m and a weight of up to 158 kg (348 lb), it is the biggest cat species in the Americas and the third largest in the world. Its distinctively marked coat features pale yellow to tan colored fur covered by spots that transition to rosettes on the sides, although a melanistic black coat appears in some individuals. The jaguar's powerful bite allows it to pierce the carapaces of turtles and tortoises, and to employ an unusual killing method: it bites directly through the skull of mammalian prey between the ears to deliver a fatal blow to the brain.

<span class="mw-page-title-main">Tiger</span> Largest species of the cat family

The tiger is the largest living cat species and a member of the genus Panthera. It has a powerful, muscular body with a large head and paws, a long tail, and distinctive black, mostly vertical stripes on orange fur. It was first scientifically described in 1758 and is traditionally classified into eight subspecies though some recognize only two subspecies, mainland Asian tigers and island tigers of the Sunda Islands.

<span class="mw-page-title-main">Leopard</span> Large spotted cat native to Africa and Asia

The leopard is one of the five extant species in the genus Panthera. It has a pale yellowish to dark golden fur with dark spots grouped in rosettes. Its body is slender and muscular reaching a length of 92–183 cm (36–72 in) with a 66–102 cm (26–40 in) long tail and a shoulder height of 60–70 cm (24–28 in). Males typically weigh 30.9–72 kg (68–159 lb), and females 20.5–43 kg (45–95 lb).

Panthera is a genus within the family Felidae, it is one of two extant genera in the subfamily Pantherinae, and contains the largest living members of the cat family. There are 5 living species, the tiger, jaguar, lion, leopard and snow leopard and a number of extinct species.

<span class="mw-page-title-main">Clouded leopard</span> Species of wild cat

The clouded leopard, also called mainland clouded leopard, is a wild cat inhabiting dense forests from the foothills of the Himalayas through Northeast India and Bhutan to mainland Southeast Asia into South China. It was first described in 1821 on the basis of a skin of an individual from China. The clouded leopard has large dusky-grey blotches and irregular spots and stripes reminiscent of clouds. Its head-and-body length ranges from 68.6 to 108 cm with a 61 to 91 cm long tail. It uses its tail for balancing when moving in trees and is able to climb down vertical tree trunks head first. It rests in trees during the day and hunts by night on the forest floor.

The term "big cat" is typically used to refer to any of the five living members of the genus Panthera, namely the tiger, lion, jaguar, leopard, and snow leopard, as well as the non-pantherine cheetah and cougar.

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References

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