Bird-dropping Spider

Cyrtarachne perspicillata

Cyrtarachne perspicillata is a species within the genus Cyrtarachne, part of the orb-weaver spider family (Araneidae). Orb-weaver spiders are known for their wheel-shaped webs and are one of the most common types of spiders found globally. The Cyrtarachne genus is particularly interesting for its diverse web structures and sometimes for the spiders’ unique appearances, which can differ significantly from the stereotypical orb-weaver. However, specific details about Cyrtarachne perspicillata might not be as widely documented as those for more commonly known species. Cyrtarachne perspicillata, like other Cyrtarachne species, may exhibit unique web-building behaviors and physical characteristics that help it blend into its surroundings or deter predators.






















Cyrtarachne perspicillata

Other Information


As with most spiders, Cyrtarachne perspicillata is venomous, using its venom to immobilize prey caught in its web. However, the venom of orb-weaver spiders is typically not harmful to humans beyond minor symptoms like localized pain, swelling, or itching.

A Danger to Humans?

There is minimal danger to humans from Cyrtarachne perspicillata. These spiders are not aggressive towards humans and bites are rare, usually occurring only if the spider is provoked or handled carelessly.

Population Status

Information on the specific population size and distribution of Cyrtarachne perspicillata is limited. Like many spider species, its population density is likely influenced by environmental factors and the availability of prey.

Bird-dropping Spider (Cyrtarachne perspicillata), Photo by David Lowenthal

Life Span:
The life span of orb-weaver spiders can vary, with many species living for about a year, through a cycle of reproduction that typically culminates in laying eggs before dying.

Weight and Length:
Specific data on the weight of Cyrtarachne perspicillata is scarce, as is often the case with spiders. Length can vary, with orb-weaver spiders generally ranging from small to medium-sized compared to other spider families.

Cyrtarachne perspicillata, a species within the orb-weaver family, has its distribution including regions like Bali, Indonesia. This adds to the known habitats supporting this species, highlighting the tropical and subtropical environments that can sustain the unique web-building and living habits of the Cyrtarachne genus. In Bali, as in other parts of its range, Cyrtarachne perspicillata likely thrives in forests, gardens, and grasslands, where it can construct its webs to catch prey, blending into the rich biodiversity of the island. The presence of this spider in Bali underscores the island’s ecological diversity and the wide distribution of the Cyrtarachne genus in suitable habitats around the world.

Bird-dropping Spider (Cyrtarachne perspicillata), Photo by David Lowenthal

Habits and Lifestyle:
Orb-weavers, including those in the Cyrtarachne genus, typically lead solitary lives, centered around their webs. They spend most of their time in or near their webs, waiting for prey to become ensnared.

Diet and Nutrition:
Their diet mainly consists of insects that are caught in their webs. The size and type of prey can vary significantly depending on the spider’s size and the web’s location.

Mating Habits:
Mating behaviors in orb-weaver spiders can vary, but males typically approach females cautiously to avoid being mistaken for prey. After mating, females may lay eggs in silk egg sacs, which they place in protected locations near their webs.