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8 Photos: The animals clearing Spain's wildfire fuel

EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has partnered with CNN to drive awareness and education around key sustainability issues and to inspire positive action.

This summer has seen ferocious wildfires tearing across southern Europe earlier in the season than usual. More than 240,000 acres of land have already been destroyed across Spain, with a recent blaze in the south quickly turning into one the country’s deadliest.

Preventing wildfires has become a high-tech endeavor of satellites, drones and AI systems. But 80 miles south of Barcelona, an ancient solution is quietly roaming across the mountain. It’s a herd of donkeys.