Why this happens

  • Praying mantises lay egg cases (oothecae) outdoors in late summer or fall.

  • Christmas trees are grown on outdoor farms, so branches can already have egg cases attached.

  • The ootheca looks like a small brown, foamy, walnut-shaped lump, which is easy to miss.

  • When the tree is brought indoors, the warmth can trigger early hatching.

Is it dangerous?

  • ❌ Not dangerous to people or pets

  • ❌ Not harmful to the tree

  • ⚠️ Impractical indoors: the babies will scatter and won’t survive long without food

What to do if you find one

  • Do not panic

  • Clip the branch holding the egg case

  • Place it outside on a tree, shrub, or sheltered garden spot

  • This allows the mantises to hatch naturally in spring, where they’re actually helpful insects

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