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Two of the United States' native mantis species: The grizzled mantis (left), Gonatista grisea, camouflages against lichen. The Arizona unicorn mantis (right), Pseudovates arizonae, has a horn-like projection on its head. 

Image credits:

Dr. Erin Powell (left image); Arlene Ripley (right image)

Rights information:

These images may only be reproduced with this Inside Science article.