-Live in big groups.
-Can eat plants only.
-Can upgrade their HP and their damage, eventually their speed.
-Have around 10-15 hp at first.
-There is Male, female and Alpha. The alpha provide an aura bonus to his horde and can "jump" (Like Kerrigan but less damage)
-They all have an aptitude to charge (like the zealot) -- I think that maybe the Alpha one should be able to use Kerrigan Psionic Dash Spell. @Sarzael