(Lion : Roar) , (Snake : Hiss) , (Frog : Bleat) , (Bees : Hum) , (Birds : Chirp)
Option:
Justification: In all other pairs, second is the noise produced by the first.

(Lion : Roar) , (Snake : Hiss) , (Frog : Bleat) , (Bees : Hum) , (Birds : Chirp)
Justification: In all other pairs, second is the noise produced by the first.