Object

From The Diablo 3 Wiki @ DiabloWiki.Net

Object is not one of the three classifications of monsters in Diablo II. All monsters belong to one of the classifications in Diablo II, and certain spells or items are more effective against different types of monsters.

It's not known if these classifications will return in Diablo III, but we're using it since it's a convenient way to sort things, until official information is released.

The three classifications of monsters we use in Diablo III are:

• Animals (category) - Feral, unintelligent enemies.
• Demons (category) - Mostly Sinister, sentient monsters from Hell.
• Objects (category) - Stationary obstacles, like traps.
• Undead (category) - Varying types of re-animated corpses, mostly from humans.

Objects are enemies, but not really monsters. Objects include things like traps, barricades, monster generators, and more. We have yet to see many more type of "Object" typ enemies in the game.

For a full list of Objects, check out the Objects Category. You can also go to the Diablo 2 Wiki to the find Diablo 2 Objects.

Diablo III Monster Navigation [e]
Animals: Animals Beast Dune Thresher Fallen Shaman Gnarled Walker Goatman Goatman Shaman Lamprey Scavenger	Demons: Demons Activated Vessel Berserker Cultist Dark Demon Dark Vessel Malformed (Nov new)	Undead: Undead Crawling Torso Ghoul Grotesque Skeleton Skeletal Archer Skeletal Executioner Skeletal Shieldman Skeletal Summoner Unburied (Nov new) Walking Corpse Wraith Wretched Dead Zombie	Bosses: Bosses Baal Diablo Mephisto King Leoric Thousand Pounder Siegebreaker Assault Beast	Objects: Objects Ghostly Orb More Monster Info Monsters Basics Monster modifiers Quest bosses Superuniques
(Nov new) = Added in November 2008