15 Rare 5-Millimeter-Long Frogs — The Size of a Pencil Tip — Born in Captivity for the First Time to Protect Species

In a heartening turn of events for the conservation of amphibians, the London Zoo has announced the successful breeding of the Afia Birago’s puddle frog. This diminutive species, endemic to Ghana, was only discovered eight years ago and is now classified as critically endangered. The birth of 15 froglets has emerged as a glimmer of hope for this species, whose natural habitat is increasingly threatened by industrial activities.

The latest arrivals are not just significant due to their rarity, but they are the first of their kind to be bred and raised in a human care environment. The froglets’ parents were part of a conservation initiative that involved transferring 20 adult frogs from Ghana to the UK in 2025. This partnership between the London Zoo and Herp Conservation Ghana, alongside the CSIR-Forestry Research Institute of Ghana, aims to tackle the dire situation facing these frogs.

Ben Tapley, curator of reptiles and amphibians at the London Zoo, underscored the importance of this breeding success, stating, “These 15 frogs are the first Afia Birago’s puddle frogs born as part of our emergency conservation programme for the species. They may be tiny enough to sit on your fingertip, but their arrival represents a huge step forward for an amphibian facing an uncertain future.”

The Afia Birago’s puddle frog has had a precarious existence since its discovery. Found solely in two specific natural pools within Ghana’s Atewa Hills Forest Reserve, the species is under threat from widespread mining activities in the area. Such environmental pressures pose a significant risk to the frogs’ survival, necessitating urgent conservation measures.

Recognising the impending crisis, the London Zoo initiated a breeding programme designed to leverage its expertise in amphibian care. The arrival of the adult frogs in September 2025 provided an opportunity for the zoo’s team to engage in extensive research about this little-known species. Unnar Aevarsson, an amphibian keeper at the zoo, reflected on the learning curve: “When the adult frogs arrived in London last year, almost nothing was known about them. Using our extensive experience caring for amphibians, our team has since learned so much more about these incredible frogs – developing the knowledge, techniques, and breeding protocols needed to give them the best chance of survival.”

The zoo is diligently sharing its newly acquired knowledge with conservationists in Ghana, which is crucial for the future of the species. The breeding of the 15 froglets, each measuring only 5 millimetres in length, provides a foundation for broader conservation efforts aimed at restoring sustainable populations in their native habitat.

Aevarsson emphasised the significance of these froglets in the larger context of conservation: “These 5mm-long froglets are cause for celebration, but our work to save Afia Birago’s puddle frog has only just begun: the wider goal now is for our partners to establish sustainable conservation populations in Ghana that can support their recovery in the wild — these births make that a real possibility.”

Efforts are underway to establish a conservation breeding facility in Kumasi, Ghana. This facility will be the first of its kind dedicated specifically to amphibian conservation in West Africa and aims to support the recovery of the Afia Birago’s puddle frog in its native environment. Identifying suitable release locations in the Atewa Hills Forest Reserve is also a priority, as it will facilitate the transition of captive-bred frogs back into the wild.

While the London Zoo focuses on nurturing its new arrivals, the overarching aim is to create a viable population of Afia Birago’s puddle frogs in the wild, ensuring a future for this remarkable species. As these conservation initiatives unfold, the public can witness the progress firsthand, with the froglets currently on display in the zoo’s “Secret Life of Reptiles and Amphibians” area.

The emergence of the Afia Birago’s puddle frog from near obscurity to a focal point in conservation efforts illustrates the impact that dedicated teamwork and international collaboration can achieve in safeguarding biodiversity. With continued support and a proactive approach, there is hope for the survival of this fragile species in the wild.