Save the Frogs Day

In 2008, Dr Kerry Kriger, an American ecologist who had spent his doctoral research in Northern California watching frog populations disappear from streams he had surveyed only years earlier, founded a nonprofit with a name that left no room for ambiguity about its mission: SAVE THE FROGS! The following year, on the last Saturday of April 2009, the organisation held the first Save the Frogs Day, built around a simple premise Kriger had arrived at through his own fieldwork, that amphibians were vanishing faster and more broadly than almost any other class of vertebrate on the planet, and that almost nobody outside specialist circles had noticed.

Where the day began

Kriger’s path to founding the organisation ran directly through his research: as a PhD candidate studying stream-breeding frogs in the Sierra Nevada, he documented population crashes tied to a then-newly characterised pathogen, the amphibian chytrid fungus, and came away convinced that the scientific community’s growing alarm about amphibian decline was not reaching the public, policymakers or conservation funders in anything like the proportion the crisis demanded. SAVE THE FROGS!, which he founded in 2008 and has led ever since, positioned itself deliberately as an advocacy and public-education organisation rather than a purely scientific one, and Save The Frogs Day was conceived from the outset as its flagship annual event, timed to the last Saturday of April so that it would fall consistently in spring across the Northern Hemisphere, the breeding season when frog calls are at their most audible and public engagement events are easiest to run outdoors. The day has since grown into what the organisation describes as the largest day of amphibian education and conservation action worldwide, with independently organised events reported across dozens of countries each year.

A crisis that outran public attention

The scientific case for urgency around amphibians is unusually stark even set against other well-known extinction crises. A landmark 2019 study published in Science by the herpetologist Ben Scheele and an international team of co-authors attributed the decline of at least 501 amphibian species worldwide to the chytrid fungus Batrachochytrium dendrobatidis, commonly abbreviated Bd, with 90 of those species considered likely or confirmed extinct, making it, by the study’s own description, the most destructive pathogen ever documented in terms of the number of species it has driven towards extinction. Bd infects the keratin in amphibian skin, disrupting the electrolyte balance and, ultimately, cardiac function of infected animals, and it has spread with such speed and reach since researchers first formally characterised it in the late 1990s that scientists still debate whether human trade in amphibians for the pet and food industries, rather than any single natural vector, was the primary mechanism that carried it around the globe.

The golden toad of Costa Rica’s Monteverde Cloud Forest, Incilius periglenes, has become the most frequently cited emblem of that collapse. Discovered by science only in 1966 and last confirmed seen in 1989, the golden toad vanished within a single generation of field biologists, its disappearance blamed on a combination of chytrid infection and a severe regional drought linked to an unusually strong El Niño event, and it is now widely regarded as one of the first documented amphibian extinctions attributable at least partly to climate-linked disease dynamics rather than to direct habitat destruction alone. Frogs are especially exposed to this kind of compound threat because amphibian skin is highly permeable, an adaptation that allows cutaneous respiration and water absorption but that also means frogs absorb pollutants, pathogens and changes in ambient moisture directly through their skin in a way few other vertebrates do.

A frog’s-eye view of the world

Amphibian biology contains a number of genuinely strange adaptations that Save The Frogs Day programming leans on to hold an audience’s attention. Frogs use their own eyeballs as part of the swallowing process: the eyes retract downward into the skull when the animal swallows, and the resulting movement helps push food further down the throat, which is why a frog appears to blink each time it eats. Poison dart frogs of the family Dendrobatidae, native to Central and South America, are not intrinsically toxic; researchers have established that their alkaloid-based toxicity is derived from specific ants, mites and other arthropods in their wild diet, and captive-bred poison dart frogs raised on standard feeder insects lose their toxicity entirely within a generation or two, a discovery that reshaped how zoos and researchers think about the species, since it meant captive breeding programmes aimed at reintroduction had to reckon with releasing animals that could no longer defend themselves chemically in the wild the way their wild-caught ancestors once had. Frog reproduction ranges from the familiar mass of spawn in a garden pond to genuinely bizarre strategies: the now-extinct gastric-brooding frogs of Australia, Rheobatrachus, swallowed their own fertilised eggs and brooded the resulting tadpoles in their stomachs, suspending normal digestive acid production for the duration, before regurgitating fully formed froglets, a reproductive strategy found nowhere else among vertebrates and one that vanished with the genus’s extinction in the mid-1980s before researchers had finished studying it.

Beyond disease: the other pressures

Chytrid fungus dominates headline coverage of amphibian decline, but SAVE THE FROGS! and allied researchers are consistently clear that habitat destruction, pollution, the international pet and food trade, and climate change all compound the pressure independently of disease. Wetland drainage for agriculture and urban development removes breeding habitat outright, a pressure that mirrors the wetland loss driving concern on days such as World Wetlands Day, while agricultural runoff introduces pesticides and fertilisers into the shallow, still water bodies frogs depend on for reproduction, water that amphibian skin absorbs directly rather than filtering out. The global trade in frogs for human consumption, particularly frog legs, and for the pet and laboratory-supply trades, has been identified by researchers as a plausible vector for spreading chytrid fungus between continents, since infected animals shipped for one purpose can introduce the pathogen to entirely new, previously unexposed wild populations near ports, farms and release sites, an uncomfortable footnote given how differently frogs are treated on the calendar depending on context, prized as a delicacy on occasions such as US National Frog Legs Day and championed as an at-risk taxon in need of protection on this one.

How the day is marked

Save The Frogs Day runs as a genuinely decentralised, grassroots event: SAVE THE FROGS! provides organising toolkits, educational materials and species-identification guides, and individual volunteers, school groups, universities and nature centres register and run their own local events, from wetland clean-ups and pond surveys to public lectures and amphibian-themed art competitions for schoolchildren. The organisation has also run a long-running campaign specifically opposing the use of live frogs in secondary-school biology dissection, arguing that the practice contributes to demand for wild-caught animals and that computer-based or model alternatives can teach comparable anatomy without the ecological cost, a position that has put the day’s advocacy work occasionally at odds with traditional science-classroom curricula in the United States. Researchers separately use the date to publicise new findings on chytrid resistance and captive-breeding programmes, several of which, including efforts targeting Panamanian golden frogs and Australian corroboree frogs, now function as insurance populations against the possibility that reintroduction to former wild habitat may not be viable again for years. The Panamanian golden frog in particular is now considered extinct or functionally extinct in the wild, with the entire known global population held in zoos and dedicated breeding facilities such as the Maryland Zoo’s Project Golden Frog, making the species a live test case for whether an amphibian can be maintained indefinitely in captivity while its native cloud-forest habitat remains too contaminated with chytrid spores for release to be attempted safely.

Fun facts

Frogs use their own retractable eyeballs to help push food down their throats when swallowing, visibly blinking with every gulp. Poison dart frogs are not toxic by birth; their toxicity comes entirely from specific prey species in their wild diet, and captive-bred individuals raised on ordinary feeder insects lose their toxicity within a generation. The extinct gastric-brooding frog of Australia raised its young inside its own stomach, suspending digestion for roughly six weeks at a time, a reproductive strategy unknown anywhere else among vertebrates. The 2019 Science study led by Ben Scheele linked chytrid fungus to declines in at least 501 amphibian species, making it the most destructive pathogen for vertebrate biodiversity ever documented. And amphibian skin is thin and permeable enough that frogs can absorb both oxygen and water directly through it, the same property that makes them unusually sensitive early warning indicators of pollution in the wetlands they inhabit.

A Closing Reflection

Kerry Kriger built Save The Frogs Day around a fairly narrow observation from his own graduate fieldwork, that a class of animals people mostly encounter as background noise on a summer evening was disappearing at a rate few outside specialist journals had registered. What the day has become since 2009 is broader than any single founder’s original research question: a recurring, decentralised reminder that amphibians function as one of the most sensitive indicators of environmental health available, and that a pond gone silent is rarely the first sign of trouble, only the first one people happen to notice.