Cella Wright: Can you figure out the savanna mystery?

Can you figure out the savanna mystery?

In the early 2000s, one of the world’s most widespread invasive species landed in Kenya’s Laikipia Plateau: big-headed ants. They expanded rapidly into super-colonies, preying on other insects, spiders, and even small birds. Their presence has wreaked havoc on the ecosystem and significantly changed the landscape. So, how did these tiny creatures have such a huge impact? Cella Wright investigates. [Directed by Steve West, Lazy Chief, narrated by Addison Anderson, music by George Rodriguez].

A single invasive ant species, arriving in Kenya’s Laikipia Plateau, set off a dramatic chain reaction through the ecosystem. Big-headed ants decimated native acacia ants, leaving acacia trees vulnerable and causing over 70% of these trees to disappear in some regions within two decades. As tree cover vanished, lions lost their hunting advantage and shifted from zebras to riskier water buffalo. This upheaval rippled through the savanna, affecting not only predators and prey but many species tied to the acacia’s fate.

Tiny Invaders Trigger a Savannah-Wide Ecological Domino Effect

A small invasive species, the big-headed ant, set off dramatic changes across Kenya's Laikipia Plateau. After their arrival in the early 2000s, native acacia ants vanished from many trees, leaving acacias exposed to elephants and causing tree populations to fall by over 70 percent in some areas. With fewer trees as cover, lions found it harder to ambush zebras and turned to hunting more dangerous buffalo instead. This chain reaction revealed how even the smallest species can destabilize an entire ecosystem.