2:37
Gavin Svenson, chief science officer at the Cleveland Museum of Natural History, explained to \"GMA\" that praying mantises can hatch from eggs in a home due to the warmer temperatures inside.
\"The egg cases are tricked into believing that they had already gone through winter because [of] the warmer temperatures of the house,\" Svenson said. \"They don't hatch right away. They develop over the course of a few weeks, and then surprise!\"
![\"PHOTO:](\"http://a.abcnews.com/images/GMA/praying-mantis-tree-stock-gty-jef-231129_1701273928130_hpMain_4x3t_384.jpg\")
Experts like Svenson say although praying mantis encounters are rare, homeowners should check any fresh Christmas trees before bringing them into the home.
If a praying mantis egg case is discovered, experts recommend snipping them off the tree and leaving the egg case outside.
\"If you do find a bunch of these mantises, don't worry,\" Svenson said. \"They're not harmful. They're little, delicate, fragile little creatures.\"
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