Spider Egg Sac (likely Cellar Spider)

Commonly found in dark, damp, or secluded areas such as basements, crawlspaces, attics, and corners of ceilings in homes.

Spiders are carnivorous, primarily eating small insects like flies, mosquitoes, moths, and even other spiders.

The female cellar spider often carries the egg sac in her chelicerae until the spiderlings hatch. They are known for 'vibrating' or spinning rapidly in their webs when disturbed to confuse predators.

Harmless to humans; they have very weak mouthparts and are not medically significant. They provide the benefit of natural pest control by eating common indoor insects.