Tarantulas Use Learning to Find Food and Retreats
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- Alireza Zamani of the University of Turku and independent researcher Rick C. West documented spatial orientation in tree-dwelling and burrowing tarantulas across North and South America, with all observed species showing behavior consistent with learning.
- Tree-dwelling tarantulas left their retreats each night and traveled 1–2 meters to prey-rich spots such as areas near artificial lights, then returned to the same retreats afterward.
- Burrowing tarantulas showed atypical behavior, climbing into tree canopies to forage during the dry season and shifting into shrubs or trees during rainy seasons to avoid flooding in lowland floodplain areas.
- A blind cave-dwelling tarantula from Mexico returned quickly and directly to its burrow after disturbance — matching the navigational performance of sighted species and suggesting spiders combine internal body signals with vibrations and chemical cues rather than relying on vision.
- Researchers flagged possible ontogenetic shifts in the blind species: juveniles stayed close to fixed retreats, while adults moved more irregularly, likely because growing energetic demands push them toward larger, more mobile prey.
- Zamani cautioned that the cognitive interpretation is preliminary, noting that tarantulas also rely heavily on chemical and silk-based cues that could explain retreat recognition without invoking memory.
- The findings were published in Ecology and Evolution (2026) with DOI 10.1002/ece3.73329, and the authors call for controlled experiments to disentangle learning from sensory mechanisms.
Why it matters: The study challenges the long-standing assumption that tarantulas operate mostly on fixed instinct, documenting the same direct-return behavior in a blind species as in sighted ones and showing that roughly 1,000 known tarantula species may rely on multimodal navigation — internal body signals plus vibrations, light, and chemical cues — rather than vision alone.
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