Answer:
They don't forget.
I have a powerful bite and live in rivers and swamps. People are often afraid of my big jaws. What am I?
When I'm metal or wood, I help you get home. When I'm flesh and I'm blood. In the darkness I roam.
My first is in ocean but never in sea. My second's in wasp but never in bee. My third is in glider and also in flight. My whole is a creature that comes out at night.
It is probably the most laidΒ-back member of the animal kingdom.
What is it that makes tears without sorrow. And takes its journey to heaven?