TANZANIA, March 26 -- It is around 1:30 p.m., and the sun is scorching, forcing a native Pied Crow to gently land on a towering yellow poinciana tree at Area C in Dodoma.

While the black-and-white-plumaged bird believes it has found a safe place to rest, little does it know that the same area is also home to some of its greatest enemies.

No sooner has it settled than fighting erupts. The fierce battle pits the newly landed native crow against a group of invasive house crows, also known as the Indian crows. Applying a “solidarity is power” strategy, the house crows quickly drive the pied crow away from the tree before dispersing.

Such scenarios are increasingly common in Dodoma, the ra...