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  2. Bioacoustics - Wikipedia

    en.wikipedia.org/wiki/Bioacoustics

    Sounds used by animals that fall within the scope of bioacoustics include a wide range of frequencies and media, and are often not "sound" in the narrow sense of the word (i.e. compression waves that propagate through air and are detectable by the human ear).

  3. These animals are changing therapy as we know it - AOL

    www.aol.com/article/2015/07/06/these-animals-are...

    Recently, an interesting array of animals is being used for therapy.

  4. Ultrasonic vocalization - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_Vocalization

    They are emitted by animals such as bats and rodents, and have been extensively studied in rats and mice. As opposed to sonic vocalizations, ultrasonic vocalizations cannot be detected by the human ear. USVs serve as social signals, [2] and are categorized according to their frequency.

  5. Animal echolocation - Wikipedia

    en.wikipedia.org/wiki/Animal_echolocation

    A depiction of the ultrasound signals emitted by a bat, and the echo from a nearby object. Echolocation, also called bio sonar, is a biological active sonar used by several animal groups, both in the air and underwater. Echolocating animals emit calls and listen to the echoes of those calls that return from various objects near them. They use ...

  6. Ultrasound - Wikipedia

    en.wikipedia.org/wiki/Ultrasound

    Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound.

  7. Research Shows that Animals, too, Need a Good Night's Sleep - AOL

    www.aol.com/news/research-shows-animals-too-good...

    Social hierarchy, diet, brain size and body mass are contributing factors to how much sleep particular animals naturally need. Outside factors might even i Research Shows that Animals, too, Need a ...

  8. List of animal sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_animal_sounds

    Certain words in the English language represent animal sounds: the noises and vocalizations of particular animals, especially noises used by animals for communication. The words can be used as verbs or interjections in addition to nouns , and many of them are also specifically onomatopoeic .

  9. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    Ultrasound is sound waves with frequencies higher than 20,000 Hz. Ultrasound is not different from audible sound in its physical properties, but cannot be heard by humans. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. Medical ultrasound is commonly used for diagnostics and treatment.