What does the rustling leaves and grass mean?

[iMore Question]

What does the rustling leaves and grass mean

When I walk around, I see rustling leaves and grass on some areas and I don't know what it means and when I walk near it, nothing happens

 

[robertk328]

Re: What does the rustling leaves and grass mean

Looks like you posted this a few times. See this thread: http://forums.imore.com/ask-question/367482-shaking-grass-what-does-mean-pokemon-go.html