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The race to save thousands of animals
Developed over time first seen 3 months ago
In October 1982, the closure of the diversion gates at the Itaipu hydroelectric project on the Paraná River began the rapid creation of a vast reservoir on the Brazil–Paraguay border. As water rose across forest and farmland, wild animals were forced on to shrinking patches of higher ground and temporary islands. The emergency operation, known as Mymba Kuera, brought together around 200 rescuers using boats, vehicles and helicopters to search the inundation zone for animals including monkeys, armadillos, reptiles and birds.
Itaipu’s account says the reservoir filled in 14 days and that the rescue saved 36,450 animals, which were assessed and moved to refuges or released in safer areas. Contemporary reporting described the practical difficulty of reaching islands that could disappear within hours, as well as questions over the scheme’s wider environmental consequences and the scale of outside assistance accepted. The story revisits a major wildlife-rescue effort carried out alongside a project that permanently transformed the river landscape, displaced communities and submerged extensive habitat, including the Guaíra Falls.
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In short
- Itaipu’s reservoir began filling in October 1982 after the Paraná River was dammed.
- Mymba Kuera rescuers worked against rapidly rising water to recover stranded wildlife.
- Itaipu says 36,450 animals were saved, though the dam’s environmental and social impacts remained extensive.
How this story developed
- 3 months ago In October 1982, the closure of the diversion gates at the Itaipu hydroelectric project on the Paraná River began the rapid creation of a vast reservoir on the Brazil–Paraguay border.
- BBC Science The race to save thousands of animals
- Itaipu Binacional Nuestra historia
- UPI Archives Ecologists race waters tide to save animals
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The rescue operation represented a remarkable and coordinated humanitarian achievement, successfully relocating 36,450 animals during a rapidly evolving crisis through dedicated effort by around 200 rescuers. Whilst the dam project had environmental consequences, the swift emergency response demonstrates how human ingenuity and commitment can mitigate wildlife losses associated with major infrastructure, and the relocation of animals to safe refuges represents meaningful conservation outcomes even during ecological disruption caused by development projects that meet energy and economic needs.
The case against
The dam's creation constituted a permanent and irreversible environmental catastrophe, destroying unique and irreplaceable ecosystems including the Guaíra Falls, along with displacing human communities. No rescue operation can restore what was destroyed, and celebrating the rescue risks obscuring the fundamental failure to prevent this destruction in the first place. Rather than normalising emergency salvage operations after ecological disasters, we should focus on preventing such catastrophic projects, as the permanent loss cannot be offset by emergency measures during flooding.
Explained simply
The Itaipu hydroelectric project was built on the Paraná River, along the border between Brazil and Paraguay. Its dam created a large reservoir, flooding forest and farmland and changing the river landscape.
As the water rose, animals were stranded on patches of high ground and temporary islands. The rescue operation, called Mymba Kuera, involved about 200 people using boats, vehicles and helicopters to reach them and move them to safer places.
The project also submerged wildlife habitat, displaced communities and covered the Guaíra Falls. The rescue took place amid wider questions about the environmental and human effects of building the dam.