Nature's Most Destructive Swarm | 20 Years of Planet Earth | BBC Earth

Why It Matters

Locust swarms can devastate crops, jeopardizing food supplies and economies; early detection and coordinated response are essential to mitigate massive agricultural losses.

Key Takeaways

• Desert locust eggs can lie dormant for two decades.
• Favorable conditions accelerate hoppers into winged adults within weeks.
• Swarms follow wind to low‑pressure zones rich in fresh vegetation.
• A single swarm can consume hundreds of tons of plant matter daily.
• Swarm size can reach billions, spanning up to 40 miles wide.

Summary

The video examines the desert locust, a species whose life cycle can shift from decades‑long dormancy to explosive growth when environmental cues align. Eggs buried in the soil may remain viable for up to twenty years, hatching only when rains trigger a sudden surge of vegetation.

When food becomes abundant, juvenile hoppers skip the typical four‑week maturation and develop into winged adults within days. Adult locusts release pheromones that coordinate mass movement, causing separate groups to merge into colossal swarms that ride prevailing winds toward low‑pressure zones where fresh growth appears.

A single adult consumes roughly its own body weight each day, and a swarm can devour hundreds of tons of plant material in a matter of hours. These plagues can swell to billions of insects, stretching as far as forty miles across, leaving a barren trail of stripped vegetation.

The phenomenon underscores a volatile threat to agriculture and food security across vulnerable regions. Understanding the locust’s rapid response mechanisms is crucial for early‑warning systems, targeted pesticide deployment, and climate‑adapted mitigation strategies.

Original Description

From eggs long hidden, a vast swarm of desert locusts emerges devouring everything in its path.

Celebrate 20 years of Planet Earth. Head over to the webpage to find out more: https://www.bbcearth.com/shows/planet-earth

#PlanetEarth #DavidAttenborough #PE20

Subscribe: http://bit.ly/BBCEarthSub

Sign up to our newsletter for the latest news, updates and exclusives from BBC Earth https://www.bbcearth.com/newsletter

Watch more:

Best of BBC Earth 🌍 https://bit.ly/BestOfBBCEarth

Best Animal Fights 🥊 https://bit.ly/BestAnimalFights

Videos over 10 minutes ⏰ https://bit.ly/3SHJCEJ

Planet Earth III 🌍 https://bit.ly/PlanetEarthIIIPlaylist

Frozen Planet II ❄️ https:/bit.ly/FrozenPlanetIIPlaylist

Blue Planet II in 4K 🌊 https://bit.ly/BluePlanetII4kPlaylist

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

This is a commercial page from BBC Studios. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx