Worker-class Glukkons are sterile males. No reproductive parts, just the persona of a male. The same is true for Mudokons and Sligs.
They are all born to a queen of their species/group.
The queen Mudokon, "Sam," is majorly a giant womb with a tiny body and a grandmothery smile.
The raunchy, sick looking Glukkon queen, "Lady Margaret," is almost termite-like, unable to move by themselves, and have Kinto Slaves to carry them around.
(Kintos are mainly small-bodied, large-armed creatures that transport her immense body around.)
The Slig queen is named "Skillya" (Possibly named after the character from The Odyssey bu Homer). We know nothing about what she looks like, only that she exists and that she's MEAN. She ships her sons off into the workforce as quickly as they are big enough to hold a gun.
Edit:
Dammit Mudling! How the hell are you so quick?