鲸 (jīng) means 'whale' and refers to the large marine mammals found in oceans worldwide. It is commonly used in scientific and everyday contexts when discussing marine life. In compound words, it often appears as 鲸鱼, though 鲸 alone is also standard.
我们在海上看到了一头巨大的鲸。
wǒmen zài hǎi shàng kàndào le yī tóu jùdà de jīng.
We saw a huge whale in the sea.
蓝鲸是世界上最大的动物。
lán jīng shì shìjiè shàng zuìdà de dòngwù.
The blue whale is the largest animal in the world.
这片海域每年冬天都有鲸鱼经过。
zhè piàn hǎiyù měi nián dōngtiān dōu yǒu jīngyú jīngguò.
Whales pass through these waters every winter.