Animals are Mobs found throughout the world and are typically not hostile unless provoked (with the exception of Beefalo in heat and hungry Smallish Tallbirds). Some Animals are passive and will never attack. They simply flee from danger or ignore the attacker, which typically results in their death.
Some of the creatures below will raise a player's naughtiness rating when directly killed. Some passive creatures are protected by stronger, neutral Mobs, attacking them may incur the wrath of the stronger Mob. Main example of this is Tiger Shark protecting its Sharkitten. When a neutral creature is attacked, nearby members of the same or similar species may join the fight against the attacker.
Traders are passive mob that cannot be attacked or killed, and the player can give Trinkets and certain Foods to these mobs in exchange for various rewards.