Asexual reproduction

Asexual reproduction is a mode of reproduction by which offspring arise from a single parent, and inherit the genes of that parent only.

Tribbles were bisexual (dual sexed) and were capable of reproducing at will. Born pregnant, and with sufficient food, a single tribble could breed in number exponentially, producing a litter of ten in twelve hours time. Xindi-Insectoids also reproduced asexually.