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Increasing biodiversity awareness through Citizen Science

The 'Great Southern BioBlitz', or 'GSB' for short, is an international period of intense biological surveying in an attempt to record all the living species within several designated areas across the Southern Hemisphere in Spring.

The purpose of this event is to highlight both the immense biodiversity spread across the Southern Hemisphere in the flourishing springtime, as well as to engage the public in science and nature learning using the citizen science platform iNaturalist. As we are international, in Spanish we are known as 'Gran Biobúsqueda del Sur', while in Portuguese we are known as 'Grande BioBlitz do Hemisfério Sul'.

By the end of October, the natural world is on full throttle. Flowers are blooming, insects are emerging, birds are singing, and reptiles are coming out of their winter hibernation. It makes sense for the Southern Hemisphere to observe life at this time of year!


The #GSB21 will be held from Friday the 22nd of October until the end of Monday on the 25th of October, incorporating different communities, areas and regions across the Southern Hemisphere.

To get involved as an organiser, fill in the form

See all the participating areas on our umbrella project on iNaturalist.

Use #GSB2021  #GreatSouthernBioblitz on social media

We encourage all organisers and participants to abide by local laws and regulations and refer to the

WHO COVID-19 advice for the public.