Chirpers are immature Droyne who have not been casted. If Droyne do
not caste, they continue development, though very slowly. Sexual differences
emerge, but casteless Droyne remain small and semi-intelligent and continue
to resemble immature Droyne. Those Droyne groups which have lost the
ability to caste (these are fairly common) live as primitives. Chirpers
are also psionic, so they are impossible to catch. A chirper may occasionally
befriend a human.