The latest deaths in the Moremi Game Reserve are happening months after hundreds of elephants died from ingesting toxic microorganisms.
The Ministry of Environment, Natural Resources, Conservation and Tourism also ruled out suspicions of poaching as the tusks of the elephants were found intact.
The Moremi reserve lies about 100 km (60 miles) east of Seronga, where last year’s deaths were reported.
“Further laboratory analysis is ongoing. Extensive field and air investigations have not uncovered any mortality of other wildlife species within the area,” the ministry said in a statement.
Over a period of several weeks starting in May last year, 330 elephants were found dead under mysterious circumstances near the fringes of the Okavango Delta, one of the continent’s premier tourist destinations for wildlife lovers.
Not all cyanobacteria are toxic, but scientists say the poisonous ones are occurring more frequently as climate change drives up global temperatures.