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Fierce Orbweaver Spider (Araneus saevus)

The fierce orb weaver spider spins its web in interesting patterns. Part of the orb weaver spider family, it looks a lot like the Araneus nordmanni. Get ready to uncover cool facts about this spider right here!

Fierce Orbweaver

Photo Credit: Andrew Block

Physical Description and Identification

Adults

  • Size: Male: 0.9-1.4 cm (0.354-0.55 in) Female: 1.1-2.1 cm (0.433-0.826 in)
  • Color: They are dark brown to black, with a cream or white stripe running through the abdomen.
  • Other Characteristic Features: There are several humps on the dorsal side of the abdomen.

Eggs

This spider overwinters in the eggs stage.

Spiderlings

These spiderlings are yellow.

The Web

This spider weaves webs between spruce branches at various heights, 150 cm above the ground. It is strong and not dense.

Fierce Orbweaver Spider

Photo Credit: Janine Massey

Are Fierce Orbweaver Spiders Venomous?

Yes, fierce orbweaver spiders have venom, but it’s mostly harmless to humans. Their venom helps them catch and eat their prey.

Can Fierce Orbweaver Spiders Bite?

Yes, they can bite, but it’s rare. If they do, it’s usually not harmful to humans and feels like a pinprick.

Araneus saevus

Photo Credit: Gilles Arbour

Ecological Importance and Behavior of Fierce Orbweaver Spider

The fierce orb weaver plays a significant role in the ecosystem as a natural pest controller. By catching and consuming flying insects such as crane flies and moths, they help to regulate insect populations, thus maintaining the balance within their forest habitats.

Natural Predator: This spider’s natural predators include birds and larger insects, which help to keep its population in check and prevent overpopulation of any one species within the forest ecosystem.

Prey-Predator Dynamics: The fierce orb weaver is an integral component of the food web. It serves as both a predator to smaller insects and as prey to larger animals. This dynamic illustrates the balance of nature, where each species plays a role in sustaining the ecosystem.

Relationship with Humans: Interactions between fierce orb weaver spiders and humans are infrequent and usually harmless. While they possess venom, it is not potent enough to cause harm to humans, and bites are both rare and minor.

Araneus saevus Image

Photo Credit: Andrew Block

Quick Facts

Lifespan Around 1 year
Distribution Canada and the northern United States, Russia, as well as other parts of Europe
Habitat Forests
Diet Flying insects like crane flies and moths

Did You Know

  • German entomologist Ludwig Carl Christian Koch first described this spider in 1872.

In conclusion, the fierce orb weaver spider is an essential predator within its ecosystem.

Frequently Asked Questions

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A fierce orbweaver spider is typically dark brown to black, featuring a distinct cream or white stripe along its abdomen. A key identifying feature is the presence of several humps on the dorsal side of its abdomen. Females are generally larger than males, reaching up to 2.1 cm.

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No, fierce orbweaver spiders are not considered dangerous to humans. While they possess venom to subdue prey, it is not medically significant for people. Bites are extremely rare and typically occur only if the spider feels trapped or threatened, resulting in a minor, localized irritation similar to a pinprick.

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Fierce orbweaver spiders build their large, strong, and not particularly dense webs between the branches of spruce trees. These webs are characteristically found at various heights, often around 150 centimeters (approximately 5 feet) above the ground, positioned to effectively capture flying insects within their forest habitat.

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Fierce orbweaver spiders primarily eat various flying insects, making them important for natural pest control. Their diet commonly includes crane flies, moths, and other airborne prey that become ensnared in their strategically placed webs. This feeding behavior helps regulate local insect populations within their forest ecosystem.

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A female fierce orbweaver spider’s body length ranges from 1.1 to 2.1 centimeters (0.433 to 0.826 inches). They are noticeably larger than their male counterparts, which typically measure between 0.9 and 1.4 centimeters. This size difference is common among many spider species in the Araneidae family.

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Fierce orbweaver spiders survive the winter by overwintering in the egg stage. The adult spiders die off with the cold, but the eggs laid in a protective sac remain dormant through the colder months. The spiderlings, which are yellow, then emerge from the eggs in the spring.

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The natural predators of the fierce orbweaver spider include birds and larger insects. These predators play a crucial role in the ecosystem by controlling the spider’s population. This prey-predator dynamic helps maintain a balanced food web within the forest habitats where these orbweavers are commonly found.