Celaenia excavata

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Bird dropping spider
Bird dropping spider03.jpg
Female bird dropping spider with egg sacs
Scientific classification edit
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Araneidae
Genus: Celaenia
C. excavata
Binomial name
Celaenia excavata
L. Koch, 1867

Celaenia excavata, the bird dropping spider of Australia, derives its name from mimicking bird droppings to avoid predators, mainly birds. However, there are other species of spider that resemble bird droppings, for example species of Mastophora (a bolas spider).

Habitat and appearance[edit]

The males are much smaller than the females, about 2.5 mm as opposed to 12 mm. The females have up to 13 egg sacs, with about 200 eggs each, strung together with strong threads. Their toxicity is unknown, but may be able to cause mild illness in humans.


The bird dropping spider stays motionless on its web during the day, only hunting for prey at night. It hangs down from a single silk thread and releases a pheromone which mimics the sex smells released by female moths. When a moth comes near, the spider will capture it with its powerful front legs. They can be found in Australia, mainly along the eastern and southern coasts.

External links[edit]