鏟齒喙鯨（Mesoplodon traversii）是最稀有及了解最少的鯨魚物種之一，因為從未見有活體記錄。鏟齒喙鯨的下顎兩側各有一隻明顯的大牙齒。最近有一條鏟齒喙鯨屍體被沖上紐西蘭的海灘。自 1800 年代以來，全球只有6個鏟齒喙鯨的紀錄，其中大部分都來自紐西蘭。

Spade-tooth whale (Mesoplodon traversii ) is one of the rarest and less known species of whale because it has never been seen alive. It has a distinctive large teeth on both side of its lower jaw. recently a dead spade-tooth whale was washed up on a beach in New Zealand. since the 1800s, there were only six samples of this whale species in record, most of them from New Zealand.

https://www.sciencealert.com/worlds-rarest-whale-never-seen-alive-washes-up-on-beach