Question: Duetto buffo di due gatti consists of this word or type of communication used by which animal?

Context articles: Tactile signing
Duetto buffo di due gatti
Romanization of Arabic
Speech
Smoke signal
Cued speech
Cat communication
Technical writing
Glob (TV series)
Connection-oriented communication

Tactile signing is a common means of communication used by people with both a sight and hearing impairment (see Deafblindness), which is based on a sign language or other system of manual communication.
The Duetto buffo di due gatti ("humorous duet for two cats") is a popular performance piece for two sopranos which is often performed as a concert encore.
 The "lyrics" consist entirely of the repeated word "miau" ("meow").
 Sometimes it is also performed by a soprano and a tenor, or a soprano and a bass.
Romanization of Arabic refers to the various methods and approaches that are used to formally represent varieties of Arabic, both written and spoken, in the Latin script.
 Romanized Arabic is used for a number of different purposes, among them transcription of names and titles, cataloging Arabic language works, language education when used in lieu of or alongside the Arabic script, and representation of the language in scientific publications by linguists.
 These formal systems, which often make use of diacritics and non-standard Latin characters and are used in academic settings or for the benefit of non-speakers, contrast with informal means of written communication used by speakers such as the Latin-based Arabic chat alphabet.
Speech is the vocalized form of communication used by humans, which is based upon the syntactic combination of items drawn from the lexicon.
 Each spoken word is created out of the phonetic combination of a limited set of vowel and consonant speech sound units (phonemes).
 These vocabularies, the syntax that structures them, and their sets of speech sound units differ, creating many thousands of different, and mutually unintelligible, human languages.
 The vocal abilities that enable humans to produce speech also enable them to sing.
The smoke signal is one of the oldest forms of long-distance communication.
 It is a form of visual communication used over long distance.
 In general smoke signals are used to transmit news, signal danger, or gather people to a common area.
Cued Speech is a visual system of communication used with and among deaf or hard-of-hearing people.
 It is a phonemic-based system which makes traditionally spoken languages accessible by using a small number of handshapes, known as cues (representing consonants), in different locations near the mouth (representing vowels), as a supplement to speechreading.
 The National Cued Speech Association defines Cued Speech as "...a visual mode of communication that uses hand shapes and placements in combination with the mouth movements and speech to make the phonemes of spoken language look different from each other."
 It adds information about the phonology of the word that is not visible on the lips.
 This allows people with hearing or language difficulties to visually access the fundamental properties of language.
 It is now used with people with a variety of language, speech, communication, and learning needs.
 It is different from American Sign Language (ASL), which is a separate language from English.
 Cued Speech is considered a communication modality, but can be used as a strategy to support auditory rehabilitation, speech articulation, and literacy development.
Cat communication is the transfer of information by one or more cats that has an effect on the current or future behaviour of another animal, including humans.
 Cats use a range of communication modalities including vocal, visual, tactile and olfactory.
Technical writing is any written form of writing or drafting technical communication used in a variety of technical and occupational fields, such as computer hardware and software, engineering, chemistry, aeronautics, robotics, finance, medical, consumer electronics, and biotechnology.
 It encompasses the largest sub-field within technical communication.
Glob is an Italian television comedy produced by Enrico Bertolino which addresses the language of communication used by the mass media and other such topics.
 The show offers numerous observations on the poor communication of television journalists.
Connection-oriented communication is a network communication mode in telecommunications and computer networking, where a communication session or a semi-permanent connection is established before any useful data can be transferred, and where a stream of data is delivered in the same order as it was sent.
 The alternative to connection-oriented transmission is connectionless communication, for example the datagram mode communication used by the IP and UDP protocols, where data may be delivered out of order, since different packets are routed independently, and may be delivered over different paths.