Answer:
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
When I am alive, people sing. When I am dead, people clap hands. What am I?
I am a busy worker who is a water mammal.
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.