Scuttlers var addthis_config = {"data_track_addressbar":true};

Scuttlers is a Tyranid Biomorph.

In 4th Edition Scuttlers is the name given to certain Tyranids which are intelligent and stealthy, making use of terrain to creep closer and closer to the enemy before the main attack is launcher. Genestealers and Gaunts are the only Tyranids able to take the ability.^1-p33

Sources

• ¹:Codex: Tyranids (4th Edition) (identical entry in Warhammer 40,000: Wargear p57)