Correct

咕咕

/ gū gū / 
Strokes

Example

As an Onomatope

(of a hen) cluck/cackle/squawk; (of a pigeon) coo/croon

1
Gēzi
鸽子
zài
在
línzhōng
林中
gūgū
咕咕
de
地
jiào
叫
  
。

Doves were cooing/crooning in the trees.