<prompt> Fingqa isihloko: Kusukela kuma - peacock kuya ezinyonini zasepharadesi, izinyoni ezinduna zaziwa kahle ngokubukisa ngezimpaphe zazo ezinemibala egqamile njengendlela yokuheha umngane. Nokho, ucwaningo olusha lusikisela ukuthi empeleni izinyoni zesilisa kungenzeka ziqala ukuhluka kancane kowesikazi ngokuhamba kwesikhathi. Lokhu okutholakele kuphonsela inselele isici esiyinhloko semfundiso yokuziphendukela kwemvelo eyasungulwa uCharles Darwin okokuqala eminyakeni engu-156 edlule. I-Choco Toucan yesilisa neyensikazi esithombeni esingenhla zombili zinezinsiba ezifanayo ezinemibala egqamile, okusikisela ukuthi elinye igunya ngaphandle kokukhethwa kobulili liqhuba ukuvela kwemibala egqamile ezinsibeni zezinye izinyoni. Kunokuba kube nemibala egqamile yezinyoni ezingamaduna evela ngenxa yokukhethwa kobulili - lapho isici siguquka khona ngokuhamba kwesikhathi ngoba sibhekwa njengesihehayo noma isibonakaliso sokulinganisela kobulili obuhlukile - amanye amandla okukhethwa kwemvelo ayasebenza. Abacwaningi bathi imvelo uhlobo oluphila kuyo, indlela olunakekela ngayo izinsana zalo nokufuduka kwalo kubonakala kuthonya izimpaphe zohlobo. Kungase kube nzima ukungawunaki umsila wephawu, kodwa abantu abawazi umsindo owenziwe yimpaphe enhle yale nyoni. Ososayensi baye babonisa ukuthi ama - peacock anyakazisa imisila yawo ukuze enze umsindo ophansi kakhulu ukuba singawuzwa. Izinyoni ezingamaduna zingase zenze umsindo we-infrared ukuze zethuse isitha esiseduze noma ukuze zihehe isithandwa sazo. Abacwaningi base-University of Manitoba eWinnipeg, eCanada, baye babonisa ukuthi lezi zinyoni zikhipha imisindo engaphansi kwe-infrasound - engaphansi kuka-20 hertz - zisebenzisa imisila yazo nokuthi amanye ama-peacock ayasabela kuyo. Abantu abaningi bezwa imisindo ephakathi kuka-20 no-20 000 hertz. Lapho ama - peacock enyakazisa izimpaphe zawo, abantu abaningi bezwa umsindo onomsindo. Kodwa ososayensi bathola ukuthi lezi zinyoni zizwa umsindo omkhulu ophakathi kwama-decibel angu-70 kuya kwangu-108, ngokusho kocwaningo olwanyatheliswa kumagazini i-Animal Behaviour. Ama-peacock esilisa nawesikazi ayeqapha kakhulu futhi ahamba lapho abacwaningi bedlala imisindo ephansi kuwo, bese abesilisa bephendula ngokumemeza. Ochwepheshe abaqiniseki ukuthi lezi zinyoni ziyibona kanjani i-infrasound, kodwa ziyazi ukuthi ezinye ziyakwazi ukuzwa ukudlidliza ngokusebenzisa...  <response>: Lolu cwaningo lwenziwe abacwaningi base-University of Wisconsin-Milwaukee. Balinganisa umbala wezimpaphe zabesilisa nezensikazi zezinhlobo zezinyoni ezingu-977. Abacwaningi bathole ukuthi ezinye izinhlobo zibonisa umehluko phakathi kobulili kuyilapho ezinye ziye zaguquka ngakho bobabili ubulili bunemibala efanayo yempaphe. Lokhu okutholakele kuphikisa umbono kaCharles Darwin wokukhethwa kobulili bezinyoni. 