The plains of the Serengeti turn into nature’s largest maternity ward every year between January and March, when up to 500,000 wildebeest calves are born over a period of just two to three weeks.
In February, during the peak of the calving season, as many as 8,000 calves can be born in a single day—equivalent to a new birth every few seconds across the plains.
This dramatic event forms part of the Great Migration, the mass movement of millions of grazing animals between the southern Serengeti in Tanzania and the Maasai Mara in Kenya.
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Wildebeest time their births to coincide with the rainy season. Calving primarily takes place in the short-grass plains of the Ndutu region in the southern Serengeti and the Ngorongoro Conservation Area. The fresh volcanic grasses are rich in calcium and magnesium, helping to boost milk production, while the open landscape makes it harder for predators to approach undetected.
The birthing period begins abruptly, with around 80–90% of calves born within a narrow three-week window. This highly synchronised baby boom is an effective survival strategy: the sheer number of calves overwhelms predators such as lions, hyenas and cheetahs, ensuring that many survive.
Wildebeest calves are typically born in the centre of the herd with their eyes open. They can stand within two to five minutes and are able to run with their mothers shortly afterwards. Within a few days, they are fast and agile enough to evade many predators.
What is a wildebeest?
Also known as a gnu, the wildebeest is a large migratory African antelope belonging to the Bovidae family. It has an ox-like head, a shaggy mane, a sloping back and curved horns. The name 'wildebeest' comes from Afrikaans (wildebees), meaning 'wild beast' or 'wild ox', a term coined by Dutch settlers in the 18th century who thought the animal resembled wild cattle. The word 'gnu' originates from the Khoikhoi people, mimicking the nasal snorting sound the animal makes.
What is the Great Migration?
Wildebeest are famous for their vast annual migration across the Serengeti and Maasai Mara ecosystems. The Great Migration is a continuous, year-round movement in search of fresh grazing and water.
More than 1.8 million wildebeest and around 300,000 zebras - along with species such as impala, eland, and Thomson’s gazelles – travel in immense herds through Tanzania and Kenya. The cycle includes several key events, notably the calving season, the rut and dramatic river crossings.
This journey is hazardous. Lions, hyenas, cheetahs, African wild dogs, and crocodiles all prey on the herds. Each year, over 250,000 animals are estimated to die during the migration, with calves and older individuals most at risk.
Where does wildebeest calving take place?
The herds gather in the nutrient-rich, short-grass plains of the Ndutu region, which stretch across the southern Serengeti into the Ngorongoro Conservation Area. Calving occurs between January and March, peaking in February when rain-fed grasses are most abundant.
Although predators are present, their density is lower in these open plains than in other areas, which helps reduce ambush opportunities.
The herd often forms a loose protective buffer around birthing females and newborns as they find their footing.
Expectant females typically give birth before midday. Labour is brief – often lasting only minutes – and calves are usually born while the mother is standing. Mothers encourage their young to stand and move quickly before allowing them to nurse.
What is a wildebeest calf like?
Wildebeest calves are highly adapted for survival in an open, predator-rich environment. At birth, they weigh around 20 kg (45 pounds) and already have well-developed legs and soft hooves.
Mobility is their main defence. Within minutes, a calf can stand, and within an hour it can run with the herd. Their coat is a lighter yellowish-brown compared to the darker grey of adults, and they lack the characteristic beard and fully developed horns.
Calves form a strong bond with their mothers immediately after birth, using sound and scent to stay close in vast herds. Despite being born in huge numbers, many fall prey to predators in their first weeks of life, making this an especially vulnerable period.
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