고래의 주 사망 원인으로 남아있는 선박 충돌 Slowing down big ships not enough to protect right whales from fatal strikes: study 기사소개: www.kosen21.org/info/globalNews/globalNewsDetail.do?articleSeq=NEWS_000000000000312 기사원문: www.cbc.ca/news/canada/nova-scotia/ship-speed-size-right-whale-deaths-research-three-calves-1.5846906