Giant Wasps are the basic flying enemies in Kingdom Rush: Frontiers.
Giant Wasps
Description
These fearful creatures are often trained to serve as aerial hunters.
Giant Wasps are basically Gargoyles from the original Kingdom Rush: flying enemies with the intent of reaching the exits as quickly as possible, as they cannot be engaged by soldiers nor be in reach of bombards.
Strategy
However, archers and mages will kill Giant Wasps fairly quickly, as they are designed to avoid damage, not to withstand it.