Biological Importance of the Ngorongoro Conservation Area Inside the Ngorongoro Crater: Biodiversity, Evolution & Endemism

The unique combination of altitude, climate, and volcanic soils in the crater creates a mosaic of habitats, from open savannahs and grasslands to dense montane forests and alkaline lakes.

As a protected area, the crater floor alone sustains an array of habitats for over 30,000 large

mammals, namely ungulates (hoofed plant-eating mammals) like Blue Wildebeest (Connochaetes taurinus), Plains Zebra (Equus quagga), and several species of Antelope alongside The Big Five: the only place on Earth to see all five in a single day!

The Big five: No Place Like It

• Lions (Panthera leo) can be found resting in the sun, as the crater is home to the uniquely isolated and densest population of lions, which hold significant scientific importance as the world's most studied population. These lions suffer from a lack of genetic diversity, significant inbreeding has led to severe decline in the past. The population now sits at around 60 individuals thanks to the active effort from KopeLion for their conservation.

• Elephants herds (Loxodonta africana) can be seen across the upper rim forests, alongside Tuskers (solitary and large bull elephants with very long tusks) which graze the mineral rich tall yellow acacia trees (Vachellia xanthophloea) of the Lerai Forest.

• Elusive Leopards (Panthera pardus) can been spotted skulking in the forest closer to the ridge if you’re lucky enough, as the NCA hosts a “healthy” leopard population. It is worth noting however that the Leopard is classified as ‘Vulnerable’ on the IUCN (International Union for Conservation of Nature) Red List.

• Cape Buffalo (Syncerus caffer). One of Africa’s most formidable animals, and one of the most commonly spotted animals across the NCA (population of 4,000 in the crater). Appearing cow like and placid, these highly social animals are actually extremely dangerous, especially when it comes to protecting their young.

• Black Rhinos (Diceros bicornis) a critically endangered and smaller rhino species are also seen within the crater., mainly at the Gonor Swamps. Characterised by their prehensile (capable of grasping) hooked lip, which is an evolutionary adaptation for browsing on shrubs and bushes more so than munching grass.

Species Interactions & Ecological Webs

Oxpeckers on rhinos, predator-prey dynamics, grazing pressure, it’s all interconnected. The Yellow-Billed Oxpecker (Buphagus africanus) and the Red-Billed Oxpecker (Buphagus erythrorynchus) are often seen riding on the Rhinos back. Known in Swahili as Askari wa kifaru, (“Rhino’s Guard”) are often seen riding along with the rhinos. These birds act as sentinels, alerting the rhinos to potential predators, and also remove and eat parasites, helping keep the rhinos healthy and tick-free.

This biodiversity reservoir is also home to over 500 bird species, including the near-threatened Lesser Flamingo (Phoeniconaias minor), which gather in the salty waters of Lake Magadi. “Magadi” comes from the Maasai word for salty, a reference to the lakes highly alkaline water. The flamingos feed on the blue-green Spirulina algae, which contains pigments that turn the birds pink due to the photosynthetic properties.

Not like the TV

The Great Migration is a year-round wildlife phenomenon, determined by the rains. Each year the migration involves 300,000 Zebras and 1.3 million Wildebeests, these animals move in a clockwise pattern along the Eastern edge of the Serengeti and into the NCA, where fresh grazing lands await (but their predators follow closely behind). No matter how many documentaries you’ve seen, nothing compares to the sheer scale of the migration in person. When the Great Migration moves through, the savannah comes alive in ways you have to see to believe.

Watching the migration unfold is like seeing the pulse of the savannah itself. This seasonal rhythm has repeated for millennia; supporting the food web, and allows a dynamic mix of resident and transient species to coexist. Resident species being animals that live in a particular area and do not move around, and transient species being animals that appear briefly in an area, but do not establish a sustainable population in that area.

Endemics of the Crater:

Due to the discussed unique geography and isolation of the crater (see Blog 2), it is the perfect place to foster the evolution of endemic species. Endemic meaning a plant to animal that is ‘native’ and restricted to a specific area’. An example of which is an endemic mammal whose home is the top the crater. The Mduma’s shrew (Crocidura mdumai) lives in the montane forests of the South-Eastern edge of the crater (and is found no where else on the planet). The shrew was only described by scientists in 2009 proof that the crater still holds secrets waiting to be discovered! Alongside these endemic, rare and beautiful animals, the crater also supports a variety of endemic plant species including various types of wild orchid, yellow-fever acacia trees (Acacia xanthophloea) and the succulent tree candelabrum euphorbia (Euphorbia candelabrum).

A Living Laboratory for Scientists:

The NCA isn not only a refuge for wildlife, but a ‘living laboratory’ for the understanding of ecosystem dynamics, evolution and the coexistence between humans and nature. Research conducted here helps scientists understand how ecosystems adapt under pressure knowledge essential for protecting the NCA’s wildlife into the future. Standing inside the crater feels like stepping into an open-air museum of evolution: everything around you is alive, dynamic, and deeply ancient all at once.

Want to understand the pressures facing this ecosystem? Read my next blog: Threats and Conservation of the NCA…

Want to Journey to the Centre of the Earth and see this biodiversity for yourself? Contact Vertical Sky Safari and let us organise you BIg Adventure.

Vertical Sky

Back to Blog