Largest Citizen Science Projects by Participation

A ranking of the most significant global community-led research initiatives by active volunteer contributor count.

The top 3

  1. iNaturalist Global Database: The premier platform for biodiversity records, boasting over 200 million observations from millions of contributors worldwide. iNaturalist
  2. eBird Avian Observation Network: Managed by the Cornell Lab of Ornithology, it hosts more than 1.5 billion bird observations to track global migration patterns. eBird
  3. Zooniverse Research Collective: A massive platform featuring over 100 active projects ranging from space exploration to historical transcription with 2.5 million users. Zooniverse

Sources

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