This page contains information about content from the Alpha Test Phase or Pre-Alpha Development Phase. This did not appear in the final game.
Ants were creatures in Nimbus Park and early versions of Avant Gardens. While they could be smashed, it is unknown if they had the ability to hurt the player. They spawned from ant hills scattered around the premesis. 
On December 19th, 2011, a LEGO UniverseGM named Shival hosted a party for players in Nexus Tower, spawning various objects, including a Maelstrom-fuming ant hill. Two more identical ant hills were spawned at Red Blocks and Avant Gardens on January 30, 2012. However, no ants were present at any of the events.
↑locale.xml, lines 47,996 through 48,465 (Nimbus Park NPC dialogue) contain many mentions of ants, such as "Man, I hate ants!", "These ants are everywhere!", and "Try smashing some ants in the park."