Summary:
- Hundreds of elephants have died in Botswana's Okavango Delta region, with the cause initially a mystery.
- Investigations by scientists have found that the elephants likely died from drinking water contaminated with cyanobacteria, a type of toxic algae.
- The die-off highlights the growing threat of climate change and environmental degradation, which can disrupt ecosystems and lead to the spread of harmful substances that endanger wildlife.