A black widow spider’s eggs are encased within a silken sac, typically pear-shaped or globular. This structure is usually off-white to tan in color. The size of the egg sac varies, but it’s generally around inch in diameter. The sac provides protection for the developing eggs until they hatch.
The protective egg sac ensures a higher survival rate for the spiderlings. This is crucial because it shields the eggs from predators, environmental elements, and desiccation. Historically, the presence of these egg sacs near human dwellings is a point of concern due to the venomous nature of the black widow spider.
