老鳥啁啾，小鳥吱吱叫。

Old birds sing, young birds twitter.

Source: Tatoeba

Sentence Composition

1 老鳥 lǎoniǎo (coll.) old hand; veteran
2 啁啾 zhōujiū
  1. (bird) twitter
  2. chirp
3 小鳥 xiǎoniǎo
  1. small bird
  2. young bird (hatchling, nestling, fledgling, chick)
  3. (fig.) penis (kiddie term)
  4. (golf) birdie
=4 吱 zhī (onom.) creaking or groaning
=4 吱 zī (onom.) chirp; squeak; creak
=5 吱 zhī (onom.) creaking or groaning
=5 吱 zī (onom.) chirp; squeak; creak
=6 叫 jiào
  1. to shout
  2. to call
  3. to order
  4. to ask
  5. to be called
  6. by (indicates agent in the passive mood)
=6 叫 jiào variant of 叫 jiào