After you kill the first, killing the next is easy.
This is a famous quote in Brazil and, oddly enough, I am proof that it makes sense.
I do not remember exactly when it was the first animal I killed, but I remember I started killing pigeons.
Backed by my father and my inseparable air gun, I removed the pigeon population from the roof in record time. Later, I specialized in killing frogs. Together with my friends, we killed the frogs shooting, beating and sometimes even burning them alive. I really was a bad boy.
Today, I thank God that my career as an murderer didn't last long, because my next victim would be cats, and I guarantee they would not have much luck with me.