Alternation of generations is typical in the life cycle of oak gall wasps in the family Cynipidae, so one generation has sexual reproduction and the next has asexual reproduction (the female needs no male involvement to produce young). Here, a female of the species Cerroneuroterus vonkuenburgi lays eggs in the dormant buds of a Chinese cork oak tree in Hsinchu County, Taiwan. Her eggs eventually hatched into asexual females, which almost immediately began laying their own eggs in the buds. This later caused galls to form. (Photo by Chang-Ti Tang, Ph.D.)