Gabriel Jorgewich-Cohen, doctorand la Universitatea din Zurich, Elveția, a început cercetarea pornind de la ideea că animalele marine ar putea comunica prin sunet.
El a folosit microfoane pentru a înregistra 50 de broaşte ţestoase, o tuatara, un peşte plămân şi un caecilian. Cercetătorul a descoperit astfel că broaştele ţestoase comunicau că vor să se împerecheze sau să iasă din ou.
„Broaştele ţestoase de mare vor cânta din interiorul oului lor pentru a sincroniza ecloziunea. Dacă strigă din interior, ies toate şi sperăm să nu fie mâncate”, a explicat Cohen, pentru BBC.
Cohen a sugerat că oamenii au o prejudecată faţă de creaturile care trăiesc pe uscat şi astfel au ignorat speciile subacvatice.
„Noi ştim când o pasăre cântă. Nu aveţi nevoie de nimeni care să vă spună ce este. Dar unele dintre aceste animale sunt foarte silenţioase sau scot un sunet la fiecare două zile”, a spus Cohen.
Cohen a înregistrat, de asemenea, tuataras care emit sunete pentru a-şi păzi teritoriul.
Aceste descoperiri pretind să rescrie o parte din ceea ce se știe despre evoluţie. Ele sugerează că toate vertebratele care respiră pe nas şi folosesc sunetul pentru a comunica au descins dintr-un singur strămoş în urmă cu 400 de milioane de ani, în perioada Devoniană, când majoritatea speciilor trăiau sub apă.
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