The Problem

Micro frogs (Microbatrachella capensis) are South Africa’s smallest frogs, yet they face some of the country’s greatest environmental challenges. At only 18mm long, they are as small as an adult’s thumbnail. Historically, they were found in the ephemeral wetlands of the Western Cape. Their range extended from the Cape Flats to the coastal plains of Agulhas in the southwest. Today, only one stronghold population remains intact on the Cape Flats: the Kenilworth Racecourse Conservation Area (KRCA).

This population is now isolated by geographical barriers from several other small subpopulations in the Overberg District. Micro frogs have highly specialised habitat requirements. They rely on fynbos shrubland growing in acidic soils. These soils are found where low-lying blackwater wetlands occur, with a pH ranging between 4-6. Even within KRCA, the species is restricted to only those wetlands that meet these specific conditions.

Their limited area of occupancy is very small. Their distribution is also severely fragmented. This led to their classification as Critically Endangered on the IUCN Red List. They have held this status since their assessment in 2004.

The primary threats to their survival include habitat destruction and degradation. This is caused by urban development, agriculture, and invasive alien plant infestations. These invasive species alter soil chemistry, outcompete indigenous fynbos vegetation, and ultimately degrade water quality. The remaining population at KRCA signifies the last refuge preventing the species from being completely extirpated from the Cape Flats.

The Solution

Ensuring the survival of micro frogs in the Cape Flats depends on the long-term protection and management of their habitat. Nature Connect, on behalf of Race Coast, actively manages the KRCA. They safeguard this vital subpopulation. They strive to minimise the impacts of surrounding urban pressures.

The site includes 16 seasonal wetlands. Three of these wetlands are identified as high-density breeding sites. The remaining wetlands serve as satellite habitats. Micro frogs move between these satellite habitats.

Nature Connect, CapeNature, and the City of Cape Town’s Biodiversity Management Branch collaborate. They watch micro frogs during their breeding season from July to September. Call surveys are used for this purpose. Wetlands are visually divided into quarters, with observers stationed in each zone to count calls accurately and avoid overlap. Habitat data is collected during surveys, and management interventions are recommended where necessary. These interventions range from invasive alien plant clearing to habitat restoration. Reed management is also included. These measures have helped keep the population stable.

Water quality is closely monitored through pH testing. Fixed-point photography tracks wetland changes. Water-level monitoring is used for long-term trend analysis.

Male call count estimates over the last five years average a population of around 200 microfrogs.

Race Coast, the landowner of KRCA, is now undergoing a stewardship agreement process. This process aims to have KRCA officially proclaimed a Nature Reserve. It will guarantee long-term management and security for micro frog habitat on the Cape Flats.

Further Conservation Efforts

Extra conservation solutions include restoring other historically suitable wetlands on the Cape Flats to support future reintroductions. Research into these opportunities has already begun within the City of Cape Town’s Biodiversity Management Branch. This work focuses on addressing water quality issues. It also includes restoring wetland role and reintroducing suitable sedges. Locally indigenous plant species are being reintroduced to surrounding areas.

Positive Conservation Outcomes

Recent surveys have uncovered new insights about micro frog populations. They identified a new subpopulation of micro frogs within the Nuwejaars Special Management Wetlands in the Overstrand region. This discovery has expanded the species’ area of occupancy by 148.7 km², increasing known locations from four to five since 2017. Micro frogs were officially downlisted from Critically Endangered to Endangered on the IUCN Red List in 2025. This change was a result of the improved understanding of their distribution (Microbatrachella capensis (Cape Flats Frog)). This signifies a significant conservation success for these tiny amphibians.

Encouragingly, a single micro frog has also been recorded in wetlands at Youngsfield. This was documented as a Micro Frog from Wetton Road in Cape Town, Western Cape, ZA. The date was August 28, 2025 at 06:58 PM. The observer was Luke Goddard on iNaturalist. It is located approximately 250 m from the nearest KRCA wetland, across a major road. This record suggests that, under suitable conditions, micro frogs are capable of limited movement across fragmented landscapes. This offers a small but meaningful glimmer of hope for future connectivity.

In conclusion

There is hope for micro frogs to bounce back with improving population numbers through effective management interventions. Habitat suitability and the number of mature adults are continuing to decline across most localities. Nevertheless, the Kenilworth Racecourse Conservation Area remains a vital refuge. By maintaining and expanding conservation efforts, we can continue reversing the red for this species.