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Why do many birds and mammals migrate seasonally in African savannas?

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Flat savanna plain with scattered acacia trees under a partly cloudy sky in Serengeti National Park, Tanzania. — Savanna A savanna marked with acacia trees in Serengeti National Park, Tanzania. Africa's Serengeti Plain is commonly used as an example of the savanna biome—a hot, seasonally dry ecological region characterized by an open tree canopy (i.e., scattered trees) above an understory of continuous grasses.

Many birds and mammals in African savannas migrate seasonally primarily to adapt to the dramatic fluctuations in their food supply caused by the succession of wet and dry seasons.12

During the wet season, vegetation is lush and food is abundant, allowing animals to spread out across the landscape. However, as the dry season progresses, these green plants disappear, forcing many species to move elsewhere in search of better resources.12

Key aspects of these migrations include:
* Resource Seeking: Herds of large mammals, such as wildebeests and zebras, travel vast distances to follow the availability of fresh grass and water.1
* Concentration: During the dry season, animals often congregate around remaining water holes, as these become critical survival points.1
* Adaptation: While some species remain in small areas, many others have evolved to undertake these seasonal movements to survive the periods when moisture is inadequate for plant growth.12

These migrations are essential survival strategies that allow wildlife to navigate the environmental challenges of the savanna ecosystem.2