N'agbanyeghị nke ahụ, otu ìgwè ndị ọkà mmụta ihe ndị dị n'oké osimiri, nke Mary Ann Daher nke Woods Hole Oceanographic Institution duziri, kọrọ na New Scientist na December 2004 na ha anọwo na-enyocha otu whale na North Pacific ruo afọ 12 nke "na-abụ abụ" na 52 Hz. Ndị ọkà mmụta sayensị enweghị ike ịkọwa ọdịiche a dị egwu site na iwu; Otú ọ dị, ha kwenyere na whale whale na-adịghị ka ọ bụrụ ụdị ọhụrụ, na-atụ aro na ụdị ndị a maara ugbu a nwere ike ịnwe ụda olu dị ukwuu karịa nke a na-eche na mbụ. E nwere nghọtahie na obodo nke whale whale na-eme ka ụda olu dị omimi na ma ọ bụ ụda dị omimi nke gburugburu ebe obibi. Otú ọ dị, ndị ọkà mmụta sayensị na-ekwu na a na-anụkarị mkpu na mkpu na mkpu mkpu mkpu mkpu mkpu mkpu na mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mkpu mk
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