Lần đầu phát hiện tiếng kêu như súng bắn của cá voi
Nhóm nghiên cứu từ Phòng thí nghiệm Greenpeace thuộc Đại học Exeter của Anh và Đại học Stellenbosch của Nam Phi đã dành 11 ngày để ghi lại âm thanh của cá voi lưng gù xung quanh ngọn núi ngầm Vema Seamount ở Đại Tây Dương, cách Nam Phi hàng trăm dặm về phía tây, và phát hiện một loại tiếng kêu hoàn toàn mới, theo nghiên cứu xuất bản trên tạp chí JASA Express Letters hôm 20/4.
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