The common frog (Rana temporaria) is the most widespread amphibian in Britain and a familiar sight in gardens, wetlands, and meadows. Despite its ubiquity, frog populations face pressures from habitat loss, disease, and environmental change that deserve conservation attention.
Common frogs hibernate through winter, typically in compost heaps, under logs, or in pond mud. They emerge in late February to April to breed in ponds, where males call to attract females. Spawn (large jelly-coated egg masses) is laid in shallow water; tadpoles develop over approximately 12-16 weeks before metamorphosing into froglets. Adult frogs are largely terrestrial, returning to water primarily to breed.
Adult frogs prey on invertebrates including slugs, insects, worms, and spiders, making them valuable natural pest controllers in gardens. Tadpoles feed on algae and microorganisms, playing a role in pond ecology. Frogs are themselves prey for herons, otters, grass snakes, hedgehogs, and birds of prey — sitting at a critical mid-trophic position in food webs.
Garden ponds are among the most important habitats for common frogs in the UK. Creating and maintaining a garden pond — even a small one with gently sloping sides, no fish (which eat tadpoles), and some vegetation — significantly benefits local frog populations. Ponds should have access and egress points for amphibians and connect to terrestrial habitat with long grass, log piles, and compost heaps.
Ranavirus infection causes significant suffering: ulceration, haemorrhage, and immobility before death. While intervention in wild frog populations is rarely practical, reporting mass mortality events to the Frog Mortality Project (Garden Wildlife Health) helps monitor disease spread. Sick frogs should not be moved between sites. Ponds and equipment used in diseased areas should be disinfected before use elsewhere.