The rule book and board have conflicting rules for the Chomp 'Em attack.
Page 4 of the rules state:
On a natural 6 on attack dice, deal one hit and return one random Zombie from the dead pile to this location.
The back cover of the rules and the game board state:
returns one Zombie from dead pile to grave.
So which is it? Does the Zombie return to the location or to the grave?