Xióngxìng jiǎojīng de cháng yá qíshí shì yī kē yáchǐ.
The male narwhal's long tusk is actually a tooth.
Tips
culture
'Horn whale' — the spiraled 'horn' is actually a canine tooth that grows through the upper lip, up to 3 meters long. Medieval Europeans sold narwhal tusks as unicorn horns; the legend likely traces back to them.
