A photo of a mushroom, a moth or a garden bird might not seem like much. Over one long weekend this November, it could become a data point in one of the world's biggest citizen-science projects — and in South Africa's case, it might even help rediscover a species thought lost for a century or more.
The Great Southern Bioblitz 2026 runs from 27 to 30 November, inviting anyone in the Southern Hemisphere to photograph wild plants, animals and fungi and upload them to the free iNaturalist app. No expertise needed — the app's community and AI tools help identify what you've snapped. You then get an extra two weeks after the event to finish uploading and lend a hand with identifications.
South Africa punches well above its weight here. In 2025, local participants logged 103,380 observations covering 12,434 species — more than any other country and over a third of the global total. The Western Cape alone topped 26,000 observations, while the Overstrand district, with more than 15,000, was the single leading region worldwide. Globally, the event has grown fast since launching in 2020: the 2025 edition drew 282,261 observations of 37,550 taxa from just under 10,000 people.
Why bother? Because the data is genuinely used. The South African National Biodiversity Institute (SANBI) draws on iNaturalist records for Red List assessments and land-use decisions. The results can be remarkable: SANBI's 2024/25 reporting credited citizen observations with three plant species new to science and the rediscovery of four species feared extinct in the wild. Closer to the Garden Route, a geometrid moth called Drepanogynis insciata — unseen for 147 years — was rediscovered in the Western Cape between 2020 and 2023 thanks to photographs uploaded to the platform.
For 2026, the Garden Route's Wild Rescue nature reserve is leading the charge, and it's running practical iNaturalist workshops on Saturday 28 and Sunday 29 November. Attendees learn the app indoors, then hit the reserve's walking trails to photograph and log what they find, with the team on hand to help upload and identify. Just bring a smartphone with the app installed — timings and bookings will be announced on Wild Rescue's social media closer to the date.
For travellers, this is an easy win: if you're visiting South Africa in late November, a hike or a wander through a reserve doubles as genuine conservation work. Even outside the event window, iNaturalist runs year-round, so that strange beetle on your table at a Garden Route guesthouse can still be recorded and identified. It also gives you a fresh way to look at a place — and South Africa, one of the most biodiverse countries on Earth, rewards a closer look.
