Located in the lush green Kundali hills of Palakkad, Silent Valley national park is the last known region that is untouched by man. Scientists value the rich biodiversity of this place and take pains to keep it this way. The Kerala Silent Valley wildlife sanctuary has got its name due to the absence of the noisy cicadas. The Silent Valley Park is rich in flora and fauna and is home to many animals and birds. The tropical greenery and streams of rivers make this place a haven for the life forms here. The park has many unique and rare herbs and plants that have medicinal value.