Orca, also known as killer whale, is not a whale, but a dolphin. They are the top predator in the world's oceans. They even eat sharks and whales, hence the name (in fact a whale killer). They are well adapted to any climate and the most distributed mammals on earth other than humans.
殺人鯨並不是鯨魚，而是一種海豚。牠們處於海洋生物鏈的最頂端，連鯊魚跟鯨魚都吃，故名殺人鯨 (其實是鯨魚殺手 whale killer)。牠們適應力很強，是地球上除人類以外分布最廣的哺乳類動物。

Polar bears are the apex predator in the Arctic. They are the largest land carnivores on earth. To absorb heat from the sun, they actually have black skin under their colorless fur.
北極熊位居北極圈生物鏈的頂端，牠們是陸地上體型最大的肉食動物。為了吸收太陽的熱量，在牠們無色毛髮下其實有著黑色的皮膚。