Answer:
How a big, hibernating mammal would show affection.
They don't forget.
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.
I have a very long neck and eat leaves from tall trees. What am I?
I have a powerful bite and live in rivers and swamps. People are often afraid of my big jaws. What am I?
Give it food and it will live, give it water and it will die.