
Community identification
Bird's Nest Spider Egg Sac
Araneae (order)
- Order & Family
- Order Araneae, Family (varies, often Araneidae or Theridiidae)
- Size
- 3mm to 15mm in diameter depending on the species.
Natural Habitat
In foliage, tall grasses, or under sheltered structures like eaves and garden furniture.
Diet & Feeding
The adult spider is a carnivore eating insects; however, the sac itself contains hundreds of developing eggs that do not feed until they hatch and emerge as spiderlings.
Behavior Patterns
Female spiders spin these silken cases to protect eggs from predators and weather. They are often camouflaged with debris or distinctive yellow/orange silk colors.
Risks & Benefits
Benefits the ecosystem by producing spiders that control pest insect populations. Generally poses no risk to humans, though egg sacs should be left undisturbed as parent spiders may be nearby.