African Bullfrog

Pyxicephalus adspersus

Family: Pyxicephalidae | Genus: Pyxicephalus

The African bullfrog (Pyxicephalus adspersus) is one of the largest amphibians in the world, renowned for its impressive size, strength and voracious appetite. Males can reach up to 25 cm in length and weigh as much as 1.4 kg, while females rarely exceed 10 cm. In optimal conditions, this species may live for up to 45 years.

It possesses a powerful jaw equipped with bony projections that function like teeth, enabling it to grip large prey and defend itself effectively.

Geographical distribution

The African bullfrog is widely distributed across sub-Saharan Africa, ranging from Nigeria to Somalia and including Kenya, Tanzania, Mozambique, Malawi, Zambia, Zimbabwe, Angola and South Africa. Its presence is closely associated with regions characterised by temporary water bodies and open landscapes.

Habitat

This species occupies a broad range of environments, including:

Dry and moist savannahs
Subtropical or tropical dry shrublands
Intermittent freshwater lakes and marshes
Farmland, grasslands, irrigation channels and drainage ditches

During periods of drought or extreme climatic conditions, such as heatwaves or cold spells, the African bullfrog burrows deep into the ground and enters a state of dormancy. It can remain underground for over a year, emerging only when seasonal rains return.

Lifestyle and behaviour

The green tree frog is a solitary and nocturnal animal, with distinctive behaviours that set it apart from other amphibians:

Social behaviour:

It is a solitary species, except during the breeding season.
Males are highly territorial during mating and may display aggressive behaviour.

Daily activity:

Primarily nocturnal or crepuscular, although it may become active after heavy rainfall.
It burrows into the ground to avoid dehydration and extreme temperatures.

Fascinating facts:

It has two large bony projections on the lower jaw, used to grasp prey securely.
Its tongue remains folded inside the mouth and shoots out forcefully to capture food.
It may cannibalise its own tadpoles during parental care.
It is the second-largest frog in the world, surpassed only by the Goliath frog.
It features large, rounded parotoid glands that secrete a viscous, toxic substance as a defensive mechanism.

Reproduction:

Oviparous; reproduction takes place during the rainy season.
Males gather in temporary pools and produce powerful calls to attract females.
A single clutch may contain up to 4,000 eggs, which hatch simultaneously.
The dominant male guards the tadpoles, although he may consume part of the brood (cannibalism).

Ecological role:

The African Bullfrog is an opportunistic and voracious predator, capable of feeding on invertebrates, frogs, reptiles, small mammals and birds.
Its presence and reproductive success are closely linked to the arrival of seasonal rains and the formation of temporary water bodies.
Its prolonged dormancy enables it to survive in harsh, arid environments.

Diet

In the wild

Invertebrates (insects, earthworms)
Frogs and other amphibians
Small reptiles
Small mammals and birds

Under human care

A varied diet of live prey appropriate to its size is provided. Overfeeding should be avoided to prevent obesity and metabolic disorders.

Conservation status

Lista roja IUCN Rana arborícola verde (Litoria Caerulea)

The African bullfrog is classified as Least Concern (LC) on the IUCN Red List. Populations are currently considered stable, although local declines may occur due to habitat loss, pollution of temporary water bodies and collection for the exotic pet trade.

Main threats

Destruction and alteration of natural habitats
Pollution of seasonal water bodies