There is no known danger to animals or humans from cicadas. Cicadas often ruin plants or shrubs when they emerge from the ground. The worst harm they may cause is to get entangled in somebody's hair or clothing. Young cicadas, which feed on tree roots for years, may do harm, but adults do not eat, bite, or sting humans or pets. Although, their presence can attract predators like birds, squirrels, and dogs. Show more