Baby Voltigore (lvl 10) --The Baby Voltigore is the young version of the Voltigore, a Baby Voltigore can only close-combat with it's enemies, unlike it's older version, the Baby Voltigore can not use any ranged attacks and is very exposed to any kind of damage.
Baby Headcrab (lvl 1) -- Baby Headcrabs are the smallest headcrabs you can encounter, they are the weakest, yet fastest and hardest to hit headcrabs.
Black headcrab (lvl 2) --Black Headcrabs can not kill any enemies on themselves as their only attack is a poisoneous bite which put the target's health down to 1, a Black headcrab's threat become drastically big when paired with any allies, as a single hit will be enough after the black headcrab bites you, players slowly recover their lost health points after a while.
Bullsquid (lvl 16) -- Bullsquids are dangerous opponents as both it's melee and ranged attacks are fast and strong, a bullsquid usually decides to either melee or spit on it's target judging by the enemy's position.
Baby Gargantua (lvl 45) -- The baby Garg is a smaller, weaker version than the Gargantua, but is already a dangerous encounter as it can already use ranged & melee attacks and are very resistants to melee attacks.