About Whismurs
Whismur is very timid. Normally, Whismur's voice is very quiet - it is barely audible even if one is paying close attention. However, if this Pokémon senses danger, it starts crying at an earsplitting volume. If it starts to cry loudly, it becomes startled by its own crying and cries even harder. When it finally stops crying, the Pokémon goes to sleep, all tired out. Its cries equal a jet plane in volume. It inhales through its ear canals. Because of this system, it can cry continually without having to catch its breath. It stops when its ear covers are shut.
Whismur like tall grass, but prefer caves like the Desert Underpass and the Rusturf Tunnel.
Information:
Bulbapedia