Why 500 million bees have died in Brazil in three months - BBC News

In the state of Rio Grande do Sul, 400 million dead bees were found - with beekeepers in four states reporting the mass deaths.

Researchers have blamed the use of pesticides - chemical substances which are used to kill pests.

Bees have a really important role in the food chain - with around one-third of the food we eat relying on pollination mainly by bees.

These include fruits and vegetables such as avocados, broccoli and cherries.

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