Cynipids are a group of small wasps belonging to the family Cynipidae. They are known for their unique life cycles, which often involve forming galls on plants, particularly on oak trees. These galls are abnormal growths that provide a habitat and food source for the developing larvae. There are over 1,000 species of cynipids, and they play a significant role in ecosystems by influencing plant health and biodiversity. Some cynipids are also studied for their potential in biological control, as they can help manage pest populations in forests and gardens.