Question

silent valley is silent because of absence of crickets, macaque, elephants, birds

Answer 1

Yes it is correct. Britishers gave the name silent valley as there is no noise od birds, macaque etc..

Answer 2

The British named the area Silent Valley because of a perceived absence of noisy cicadas. Another story attributes the name to the anglicisation of Sairandhri. A third story, refers to the presence there of many lion-tailed macaques Macaca silenus.