Distance analysis and population calculation from sound produced by animalssoundpopulationspectral fluxdistanceThe scientists have found many ways to adapt a series of formulae for the movement of gas molecules for use with information from speech or sound to determine accurately the population density ...
Sound is a means of communication by animals. Many fishes are capable of producing sounds with the help of specialized structures. The teleost family-Sciaenidae, collectively known as the croakers and drums because of their ability for making sound. It includes about 70 genera and 270 species in...
Two types of sounds produced by the cichlid fish , are recorded and analysed. A br-r-r sound, with a main frequency of 200 Hz and a chewing sound with a main frequency of 6,000-10,000 Hz are produced during threatening; the former sound can also be heard during quivering. No sound...
People and animals can also make noises. A sudden noise made Bela jump. The birds were making screeching noises. 2. used as uncountable nouns Sound and noise can both be uncountable nouns. Sound is the general term for what you hear as a result of vibrations travelling through the air, ...
The juvenile period is an important stage of growth and development across animals, often consisting of graded stages of physical and social development. For cetaceans, locomotor and social development are key to survival after weaning; individuals require dive capabilities for successful foraging and ...
animals is a complex vibratory system. The vibration of sound sources may be excited by a blow (in the case of a bell) or by plucking (in the case of a string); a self-excited vibration mode can be maintained in such objects by a current of air (in wind instruments). Electro...
When most terrestrial animals vocalize, the lungs push air through the larynx. The vocal folds (more commonly referred to as vocal cords) in the larynx open and close as the air rushes past them, breaking the exhalation up into a series of air puffs or pulses. The resulting undifferentiated...
Right whales, so named by whalers because these animals have a high oil content and float when dead, attain a maximum length of 18 m. They may be identified at sea by a characteristic V-shaped blow (Fig. lA), light-colored horny protuberances on the upper snout which include the bonnet...
The vocal apparatus of humans and animals is a complex vibratory system. The vibration of sound sources may be excited by a blow (in the case of a bell) or by plucking (in the case of a string); a self-excited vibration mode can be maintained in such objects by a current of air (...
Discerning the precise contributions made by each of these organs has been complicated by the nature of sound as it travels through water. Since fish and other aquatic animals generally have a density similar to water’s, underwater sound travels almost unimpeded through their bodies, which makes...