The wise older brother

W (age 5): "Hey Mom, are beavers wild?"

Me: "Yes, they are."

W: "Do they eat people?"

B (age 7): "(in an annoyed voice) W, lick your hand."

W licks his hand.

B: "Is it tasty?"

W: "No"

B: "Then they don't have a taste for you."

Well there you go. 

The older brother has spoken.