The bold colors of the eastern lubber grasshopper (Romalea microptera), which vary across its geographical range, are a warning to predators. Among its other defensive behaviors and methods: spreading its wings, hissing by expelling air from its spiracles, secreting a foul-smelling froth, and vomiting. But, despite its potentially frightening appearance, it is harmless to humans and rarely a significant plant pest. (Photo credit: Jim Occi, Bugwood.org)