The Wildebeest Migration—often called “The Great Migration”—is one of Earth’s most spectacular natural events. Each year, over 1.5 to 2 million wildebeest, alongside hundreds of thousands of zebras and gazelles, undertake a circular journey across the Serengeti-Mara ecosystem in Tanzania and Kenya. It is hailed as the largest overland animal migration on the planet and is frequently considered one of the “Seven Wonders of the Natural World.”

For wildlife enthusiasts, photographers, and conservationists alike, witnessing the vast herds sweeping across endless savannahs is an unforgettable experience. Yet, it is much more than a tourist attraction: this perpetual cycle ensures the renewal of grasslands, supports complex predator-prey relationships, and maintains the ecological balance of East Africa’s iconic savannas.

 

Key Facts & Figures

• Number of Migrating Animals: ~1.5–2 million wildebeest, ~300,000 zebras, plus large groups of Thompson’s gazelles, Grant’s gazelles, elands, and impalas.
• Migratory Distance: Each wildebeest travels roughly 800 to 1,000 km (500–620 miles) annually.
• Drivers of Migration: Primarily rainfall and the availability of fresh, nutritious grass.
• Main Predators: Lions, hyenas, leopards, cheetahs, crocodiles, and wild dogs.
• Best Viewing Locations:
  • Southern Serengeti (Dec–Mar) for calving
  • Western Corridor & Central Serengeti (May–Jul)
  • Northern Serengeti and Masai Mara (Jul–Sep) for dramatic river crossings
  • Eastern & Central Serengeti (Oct–Nov)
• Mortality Rate: Up to 250,000 wildebeest and 30,000 zebras die each year from predation, river crossings, exhaustion, hunger, and accidents.

 

Why Do Wildebeest Migrate?

Wildebeest, also called gnus (members of the antelope family), migrate for two primary reasons:

1. Access to Nutritious Grasslands and Water

   • Rainfall in East Africa is highly seasonal. Certain areas produce lush grass during the wet season but become barren in the dry season. The herds follow the rains to ensure a steady supply of fresh forage.

2. Safer Calving Areas

   • In the southern Serengeti, particularly around the Ndutu Plains, short grass allows wildebeest to see predators from a distance, making it a safer place to birth and raise their newborns.

In essence, the herds move in a clockwise circuit across the Serengeti (in Tanzania) and into the Masai Mara (in Kenya), following rain and grass growth patterns year-round.

 

Geographic Overview

Serengeti National Park (Tanzania)

• Size: ~14,750 km² (5,700 mi²)
• Famous For: Vast grasslands, high density of predators, and the largest portion of the wildebeest migration.
• Sub-Regions: Southern/short-grass plains (calving grounds), Western Corridor (Grumeti River), Central Serengeti (Seronera), and Northern Serengeti (Mara River).

Ngorongoro Conservation Area (Tanzania)

• Calving Grounds: Ndutu area is especially crucial from December to March.
• Landscape: High-altitude grasslands, volcanic craters.
• Unique Feature: Ngorongoro Crater (though wildebeest do not typically migrate down into the crater in large numbers).

Masai Mara National Reserve (Kenya)

• Size: ~1,510 km² (580 mi²)
• Extension of Serengeti: Lies directly north, forming a contiguous ecosystem.
• Famous For: High density of big cats, the dramatic Mara River crossings, and massive herds during the dry season (July–September).

 

The Annual Migration Cycle: Month-by-Month

Although nature doesn’t always follow a strict schedule, the wildebeest migration generally follows this pattern:

December to March: Calving Season in the South

• Location: Southern Serengeti and Ndutu area near Ngorongoro.
• What Happens:
  • Wildebeest arrive on the nutrient-rich short-grass plains, drawn by the early (short) rains (Nov–Dec).
  • Calving Peak: Around February, hundreds of thousands of calves are born within a few weeks—sometimes up to 8,000 new calves per day.
  • Predators: Lions, hyenas, and cheetahs prey on young wildebeest. Safari-goers often see dramatic hunts and adorable newborns simultaneously.

April to June: Heading Northwest

• Location: Moving from central Serengeti (Seronera) toward the Western Corridor (Grumeti River).
• What Happens:
  • After feeding on the lush southern grass, the herds begin the trek northwest in search of fresh grazing.
  • April is often rainy, making the plains slippery. Vehicles with 4×4 are essential.
  • By May and June, vast columns of wildebeest can extend for many kilometers as they head toward the Grumeti River, facing crocodiles and other dangers.

July to September: River Crossings

• Location:
  • June–July: Western Corridor (Grumeti River) and transitioning to the Northern Serengeti.
  • July–September: Northern Serengeti and Masai Mara.
• What Happens:
  • Grumeti Crossings (June–July): Often the first major obstacle. These crossings can be smaller in spectacle than the Mara but still offer exhilarating action.
  • Mara River Crossings (July–September): The most famous part of the migration. Enormous herds gather at the riverbanks; tension builds as they plunge into crocodile-infested waters. Lion, leopard, and hyena look for vulnerable animals on the opposite shores.

October to November: Return Migration South

• Location: Northern Serengeti heading back to the central and eastern Serengeti, eventually southern plains.
• What Happens:
  • After the short rains begin (late October–November), the herds leave the Masai Mara and northern Serengeti, drifting southward.
  • By December, they settle once more on the southern short-grass plains, and the cycle begins again.

 

River Crossings in Detail

Grumeti River Crossings

• Timing: Typically between May and July.
• Location: Western Serengeti Corridor.
• Conditions & Challenges:
  • The Grumeti River is partly broken into pools, so crossings are sporadic.
  • Giant crocodiles lie in wait. Although not as famous as the Mara crossings, these can still be dramatic.

Mara River Crossings

• Timing: Generally from July through September, sometimes into October.
• Location: Northern Serengeti (Tanzania) and Masai Mara (Kenya).
• Spectacle:
  • Rapid currents, steep riverbanks, and enormous crocs create a formidable barrier.
  • Stampede effects: wildebeest often injure or trample each other, creating chaos.

Risks & Drama at the Water’s Edge

• Crocodiles: Nile crocodiles can grow over 5 m (16+ ft) long and take down adult wildebeest.
• Predators on Land: Lions and hyenas position themselves near crossing points.
• Danger to Tourists? River crossings attract many safari vehicles. Overcrowding can occur. Responsible guide practices are crucial for both wildlife safety and a quality visitor experience.

 

Predators & Other Wildlife

• Lions: The Serengeti-Mara ecosystem boasts one of Africa’s largest lion populations (~3,000 lions in the Serengeti alone). The migration brings an abundance of prey, but also fierce competition among big cats.
• Hyenas: Expert scavengers and hunters, often outnumbering lions in some areas.
• Cheetahs & Leopards: Less likely to attack fully grown wildebeest in the midst of the herd but excel at preying on calves and stragglers.
• Crocodiles: Concentrated in the major rivers (Grumeti, Mara). They rely heavily on the migration for annual feasting.
• Zebras & Gazelles: Co-migrants with wildebeest. They graze differently and help expose fresh grass layers.

 

Visitor Tips & Safari Planning

When to Visit

• Calving Season (Dec–Mar): Best for those who want to see newborns, predator action, and lush green landscapes.
• River Crossings (Jul–Sep): Iconic images of frantic wildebeest crossings. Peak tourist season in Kenya’s Masai Mara and the Northern Serengeti.
• Shoulder/Green Season (Apr–Jun, Oct–Nov): Fewer crowds, good predator sightings, but heavier rains in April–May.

Where to Stay

• Mobile Camps: They move with the herds, offering front-row seats.
• Permanent Tented Camps/Lodges: Located in prime areas (e.g., Ndutu, Central Serengeti, Western Corridor, Northern Serengeti), but require driving to catch up with migrating animals.
• Kenya or Tanzania? Both countries offer phenomenal migration experiences. Tanzania has the largest portion of the Serengeti; Kenya’s Masai Mara is smaller but often more crowded.

Avoiding Crowds

• Private Conservancies: Stay in conservancies adjacent to the Masai Mara to enjoy more exclusive game drives and optional walking safaris or night drives.
• Off-Peak Months: Consider traveling in the “Green Season” (outside peak crossing times). The herds might be more spread out, but you’ll enjoy fewer vehicles at sightings and often more budget-friendly rates.

 

Charts & Tables

Monthly Movement Overview (Text Chart)

Below is a simplified text-based chart depicting the typical wildebeest movement per month. Remember, actual movements depend on annual rainfall patterns.

Migration Highlights & Challenges (Comparison Table)

1. Is the timing guaranteed?
   No. The exact timing is dictated by rainfall. Each year can vary, sometimes by weeks or even a month.

2. Where can I see the best river crossings?
   The Mara River in Northern Serengeti (Tanzania) and the Masai Mara (Kenya) is most famous for large-scale, dramatic crossings. The Grumeti River in the Western Corridor (Tanzania) also offers exciting but generally smaller crossings.

3. Do zebras and gazelles migrate at the same time?
   Yes. Zebras, Thompson’s gazelles, Grant’s gazelles, elands, and impalas often move with or parallel to the wildebeest herds, each eating different parts of the grass layer.

4. How can I avoid the crowds?

   • Consider traveling during the “green season” (April–May) or early in the calving season.
   • Choose private conservancies adjacent to the Maasai Mara, or areas of the Serengeti that see fewer vehicles.

5. What gear do I need for photographing the migration?

   • A good DSLR or mirrorless camera with a telephoto lens (200–400mm).
   • Plenty of memory cards and extra batteries.
   • Rain protection for equipment, especially in the wetter months.

 

Closing Thoughts

The Wildebeest Migration isn’t merely a single event; it is a continuous cycle of life, death, renewal, and adaptation that shapes the Serengeti-Mara ecosystem. Each phase—from the mass calving on the southern plains to the heart-stopping river crossings in the north—is a chapter in one of nature’s most fascinating stories. For those privileged enough to witness it, the Great Migration offers a profound reminder of how animals instinctively follow ancient paths tied to rainfall and grass growth, maintaining a rhythm that has played out for millennia.

Whether you long to see thousands of newborn calves finding their legs or you dream of the chaos and drama at the river crossings, planning, timing, and flexibility are key. Above all, remember that nature operates on its own schedule. Embrace the unpredictability, and you will be rewarded with truly unforgettable moments in one of the wildest places on Earth.

 

Tanzania safaris has been creating tailor-made safaris and Zanzibar holidays for more than 10 Years 
and is look forward to helping you! It’s never too early to start planning, 
get in touch today. Contant us