When the bobber dips and the player attempts to reel in a fish, a Wandering Eye Fish or a Zombie Merman has a chance to spawn within a few blocks of the bobber in place of a fish. Zombie Arm 0.4% Spiffo Plush 0.07% Sounds Zombies are common surface enemies that appear at night and are a primary reason newer players will want to build a shelter before night arrives. Along with Demon Eyes, they are generally among the first night enemies a player will encounter, as they appear in areas a player first spawns .