Answer:
A reaction to being spooked that takes its name from waterfowl
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Men have one, women two, and when they become family, it’s three. What is it?
The moon is my father. The sea is my mother. I have a million brothers. I die when I reach land.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
I have two bodies joined together as one. When standing still I run and run.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?