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Darwin’s Bark Spider

Jan. 21, 2026

Recently, scientists from institutions in China, Madagascar, Slovenia, and the US studied bark spiders (Caerostris darwini and Caerostris kuntneri) to understand the conditions in which they produce the tough silk.

About Darwin’s Bark Spider:

  • The Darwin’s Bark Spider (Caerostris darwini) is a remarkable arachnid famed for producing the largest and toughest known webs in the animal kingdom.
  • It belongs to the family Araneidae, or orb-weaver spiders.
  • Habitat: It inhabits riverine forests and wetlands.
  • Distribution: It is found in the forests of Madagascar.
  • Characteristics of Darwin’s Bark Spiders:
    • It weaves silk that outperforms steel and most human-made fibres in both strength and toughness.
    • Their silk is more than twice as tough as any other spider silk studied.
    • Unique Habitat: Unlike most orb-weavers, it builds webs over open water rather than in vegetation.

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