From Lexicanum

Ratlings are small abhumans recruited into the Imperial Guard as Snipers.^1-p43

Background

Ratlings are the smallest type of abhuman, their ancestors having become stunted by thousands of years of inbreeding on worlds with naturally soporific climates and abundant harvests.² One such Ratling homeworld is called Ornsworld³.

Ratlings are idle, hedonistic, gregarious, over-friendly and sexually promiscuous. Their lives are spent eating until sick, drinking copious amounts of intoxicating liquids, and procreating uncontrollably. These small, loud, hungry and lecherous creatures are known as runtlings, stunties and ratlings (among other things).²

They are short and squat, although not strong or powerful, and make poor warriors; their only talent on the battlefield is sniping, which they excel at.^{1-p43, 2-p174}

Ratling Sniper Squads

Squads consist of between three and ten Ratlings, armed with Sniper Rifles and Flak Armour.^1-p43

Sources

• ¹:Codex: Imperial Guard (3rd Edition, 2nd Codex)
• ²:Warhammer 40,000: Rogue Trader
• ³:Codex: Chaos (2nd Edition)

Imperial Guard Infantry
Command Units	Command Platoon • Heroic Senior Officer • Senior Officer • Junior Officer • Sanctioned Psyker • Commissar • Priest
Flexible Troops	Infantry Platoon • Conscript Infantry Platoon • Hardened Veteran Squad • Storm Troopers • Sentinel Squadron
Combat Troops	Armoured Fist Squad • Rough Rider Squadron • Ogryn Squad
Ranged Troops	Ratling Snipers • Snipers • Heavy Weapons Platoon
Support Units	Fire Support Squad • Anti-tank Support Squad • Mortar Support Squad • Sentinel Support Squadron Special Weapon Support Squad • Techpriest Enginseer