The Great Migration: Why the Wildebeest Move and How to Plan Around Them

Every year, more than a million and a half wildebeest move through the Serengeti ecosystem alongside hundreds of thousands of zebras and gazelles. Most guides tell that story as a calendar: this month, this place. We prefer to tell it as a logic, because once you understand why the animals move, you also understand where they will be, when it is worth being there and what you can realistically expect.

Nobody leads the herd: the rain decides

There is no lead wildebeest and no route set in advance. The animals follow the rain and the fresh grass it leaves behind. When it rains in one part of the ecosystem, the herd heads there, and when the grass runs out, it moves on again. The result is a clockwise loop that repeats every year, but never in exactly the same way: a year with early or late rains shifts the timing by a week or more. That is why we distrust any itinerary that promises “the herd at this spot on the 14th”.

A dining room with shifts: zebras, wildebeest and gazelles

One of the things that surprises people most on the ground is that the migration is not a single column. It is a chain of species that feed in turns. Zebras go first: their upper teeth can cut the tall, tough stems. Wildebeest follow, preferring the medium-height grass the zebras leave exposed. And the Thomson’s gazelles come last, taking the short shoots that remain. Each species prepares the ground for the next.

That has a very useful consequence on safari: if your guide points out a large gathering of zebras, the wildebeest are usually not far away.

Why the wildebeest always calve in the south

The plains of the southern Serengeti and the Ndutu area have short grass, and that grass grows on soils formed from volcanic ash from the Ngorongoro highlands. The ground is rich in minerals such as calcium and phosphorus, exactly what a nursing mother needs. It is no coincidence that the herd returns there every year to give birth.

And they do it almost all at once. Over a few weeks around the start of the year, hundreds of thousands of calves are born. It is a survival strategy: if they are all born together, predators cannot take them all. A calf is on its feet within minutes of birth and can keep up with the herd almost immediately. Even so, the abundance draws lions, hyenas and cheetahs, which is why this season is one of the best of the year for watching predators in action, with fewer vehicles than in the dry season.

The river crossing, without the romance

The most famous images of the migration come from the northern Serengeti, where the Mara River marks the way to Kenya. Over the years we have learned that a real crossing looks little like an advertisement. The herd gathers on the bank, moves forward, stops, backs away and starts again. Sometimes the wait lasts hours, and sometimes a whole day goes by without anyone daring to jump. When one animal finally does, the rest follow all at once.

There are crocodiles in the water, but they are not the only thing that takes a toll: steep banks, the current and the push of the herd itself also count. If you want to see it, there are three things worth knowing:

• Nobody can guarantee a crossing on a specific date. Anyone who promises one is not telling you the truth.
• Patience matters more than the calendar. The more days you give the river area, the better your real chances.
• A guide who reads the herd makes the difference. Knowing when to start early, where to wait and when to switch banks is what turns a morning of waiting into a scene you will not forget.

The phases almost nobody includes in their plan

Between the calving in the south and the crossings in the north there are months that fall out of almost every itinerary, and they are no worse. Between April and June, the herd moves through the centre and west of the Serengeti in long lines, with green landscapes, the rut under way and very few people. In November and December it heads back south with the first rains, and the southern camps regain their calm. These are very rewarding times for anyone who prefers to see the migration without sharing it with dozens of vehicles.

How to choose based on what you want to see

• Calves and predators: the first months of the year, in the southern Serengeti and the Ndutu area.
• The Mara River crossing: the second half of the year, with several days of margin in the north.
• Herds without crowds: April to June, or November and December.
• A first safari with few days: the centre of the Serengeti offers wildlife all year, whether or not the herd is nearby.

If you want to see how each phase fits with the other parks, we cover it month by month in our guide to when to go to Tanzania. And if you are torn between seeing the migration in Tanzania or in Kenya, we explain it in this comparison.

How we approach it at Destiny Winners

Our team lives in Tanzania all year, based in Arusha, and follows the herd’s real movement every season. That is why the itinerary adapts to what is happening, and not only to a date fixed months in advance. All our safaris are private, with a vehicle and guide just for you, which makes it possible to start early, stay in one place as long as needed and change plans on the go. Tips and the guide’s salary are included, something most safaris do not include.

Frequently asked questions

How many days do I need in the Serengeti to see the migration?

At least two nights. If your goal is a river crossing, we recommend three nights or more in the north, because margin of days is what matters most.

Can you see the migration all year?

Yes, because the herd is always somewhere in the ecosystem. What changes is which phase you will see: calving, lines on the move or river crossings.

How many wildebeest are there in the Great Migration?

It is estimated at more than a million and a half wildebeest, alongside hundreds of thousands of zebras and gazelles. The figure varies from year to year.

What if we do not see a river crossing?

You will still see enormous herds, predators and landscapes unlike anything else. That is why we prefer to plan the trip around the whole migration, and not just one moment at the river.