Number + 头 + Noun
The classifier 头 (tóu) is used as a measure word primarily for livestock and certain large animals, such as cows, pigs, and donkeys. While 头 also means 'head' as a noun, its function as a classifier is distinct. It is placed between a number or demonstrative and the noun it modifies.
村里一共养了三十头牛。
Cūn lǐ yígòng yǎng le sānshí tóu niú.
The village has raised a total of thirty cattle.
他家新买了两头小猪。
Tā jiā xīn mǎi le liǎng tóu xiǎo zhū.
His family just bought two piglets.
草原上有一头大象在喝水。
Cǎoyuán shàng yǒu yì tóu dàxiàng zài hē shuǐ.
There is an elephant drinking water on the grassland.