Remembrance Day for Lost Species was co-founded by Feral Theatre and The Life Cairn in 2011. It is supported by a range of organisations and practitioners. It has no legal structure and is volunteer-led. The project admin is mainly carried out by ONCA staff and volunteers in the UK and by Extinction Witness in the USA.
It has evolved with support from a range of organisations and practitioners including but not limited to:
- ONCA – UK arts charity that bridges social and environmental justice issues
- Feral Theatre co-directors Persephone Pearl, Emily Laurens, Rachel Porter
- Extinction Witness founder, US-based poet Megan Hollingsworth
- Historian of extinction Matthew Stanfield
- Historian of colonialism Camilla Schofield
- Bridget McKenzie, founder of Climate Museum UK
- Azul Valérie Thomé, founder of SOULand
- The Life Cairn co-founders Andreas Kornevall, Peter Owen-Jones and Vanessa Vine
- Dark Mountain editor Nick Hunt
- Nigel Rayment ecological education researcher
- Australia-based graphic designer Julia Peddie
- Svenja Meyerricks, Director of the Centre for Human Ecology
- Art historian Cloe Ofori
- Artist Rebecca Leach
- Joel Greenberg, US-based author of A Feathered River Across the Sky and co-leader of Project Passenger Pigeon
- Radical Joy for Hard Times’ Trebbe Johnson
- Sew the Seeds founder, US-based textile artist Sherrell Biggerstaff Cuneo
- MEMO Project, an iconic architectural project to build a permanent memorial to extinct species on the Isle of Portland (England)
- Brandon Ballengee, US-based artist/biologist
- Zoomorphic magazine
- Amphibian Foundation, a US-based non-profit organisation dedicated to addressing the global amphibian extinction crisis
- Buglife – the only organisation in Europe devoted to the conservation of all invertebrates
- Extinction Symbol – the circle signifies the planet, while the hourglass inside serves as a warning that time is rapidly running out for many species and cultures.