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Mosquitoes are the most dangerous animals on the planet. They spread diseases - malaria, dengue and zika – that kill huge numbers of people and cause suffering to many more. So why not eradicate them? It wouldn’t be easy. Scientists in Mali have found the mosquito is a surprisingly formidable foe, able to hide for months and evade capture. Other scientists are working on genetically-modifying mosquito populations so that they can’t breed. But could releasing these re-modelled mosquitoes have unintended consequences? And might we accidentally destroy ecosystems by removing mosquitoes altogether? It turns out this tiny creature presents us with huge practical and ethical problems. Presenter: Michael Blastland (Image: Fumigation against the Aedes aegypti mosquito. Credit AFP/Getty)