Research published in the Zoological Journal of the Linnean Society used citizen science data from iNaturalist to trace the evolution of parental care in harvestmen spiders. The study focused on paternal guarding, a behavior where males protect eggs.
Harvestmen, also known as daddy longlegs, are not true spiders but belong to the arachnid order Opiliones. Their parental strategies vary widely across species, from no care to extended male guarding.
Researchers analyzed thousands of iNaturalist observations to map care behaviors onto evolutionary trees. This approach revealed that paternal care likely arose multiple times independently, rather than from a single common ancestor.
The findings suggest environmental pressures, such as predation risk and humidity, may drive the evolution of male guarding. However, the study's reliance on opportunistic citizen science data carries limitations in geographic coverage.
Experts note the work highlights the growing value of public science platforms for large-scale evolutionary studies, though controlled experiments remain essential to confirm causal links.