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Found this hard, foam-like brown structure attached to a fence post in the backyard

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in spring, looking like miniature adults and soon dispersing into surrounding vegetation to hunt.

There is usually no reason to scrape away a confirmed mantis egg case. Mantises eat many insects, including garden pests, although they also consume pollinators and other beneficial species. If the casing faces damage, move the twig it rests on to a sheltered continue reading …

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