Greenfinch Numbers Plummet 67% in UK, RSPB Warns of Extinction Risk
The beloved greenfinch is facing a severe population crisis in Britain, with numbers plummeting by a staggering 67 per cent since 1979, according to the Royal Society for the Protection of Birds (RSPB). This dramatic decline has placed the once-common garden bird on the UK Red List for endangered species, raising alarms about its potential extinction.
Alarming Decline in Greenfinch Populations
The RSPB's annual Big Garden Birdwatch survey, which recruited over 650,000 participants across the UK and counted more than nine million birds of over 80 species, revealed the shocking extent of the greenfinch's decline. Since the survey began in 1979, greenfinch numbers have fallen by two-thirds, equivalent to a loss of approximately two million birds since the mid-1990s.
While the charity maintains it is 'extremely unlikely' that the greenfinch will go completely extinct, the 'severe population drop' has triggered urgent conservation concerns. RSPB chief executive Beccy Speight emphasized the gravity of the situation, stating, 'Feeding birds is something millions of us love and value, but the science shows us that birds such as Greenfinches have been affected by the spread of disease at feeders.'
Trichomonosis: The Deadly Parasite Behind the Decline
The primary driver of this catastrophic decline is the spread of trichomonosis, a parasitic disease that is easily transmitted at bird feeders. The parasite thrives when large groups of birds congregate at feeding stations, particularly during warmer months. The disease spreads most readily between May 1 and October 31, creating a critical period for infection risk.
The RSPB is now urging gardeners to adopt safer feeding practices to help curb the spread of this fatal infection. While the charity isn't asking people to stop feeding birds altogether, they are recommending 'safe and seasonable' feeding approaches. During high-risk months, gardeners should pause filling feeders with peanuts and seeds to prevent excessive bird gatherings. However, small amounts of mealworms or fat balls can still be offered safely throughout the year.
Top Garden Birds and Other Species at Risk
Despite the greenfinch's decline, the Big Garden Birdwatch revealed some consistent performers in UK gardens:
- House Sparrow: Remains the UK's number one garden species with an average of 3.57 birds per garden
- Blue Tit: Second most common with 3.21 birds per garden
- Starling: Third place with 2.23 birds per UK garden
- Woodpigeon and Blackbird: Round out the top five most common garden birds
However, the greenfinch isn't the only species showing concerning declines. Starlings, known for their spectacular aerial murmurations, have seen numbers drop by 85 per cent since 1979. Once frequently the most common bird recorded in the annual survey prior to 2000, starlings are now also red-listed in the UK, with breeding populations falling by 82 per cent between 1970 and 2022.
Safe Feeding Guidelines and Alternative Support Methods
The RSPB has issued specific guidelines for feeding garden birds while minimizing disease transmission:
- Feed seasonally: From May 1 to October 31, pause filling bird feeders with seeds and peanuts to prevent large gatherings
- Maintain feeder hygiene: Clean feeders at least once weekly and move them to different locations to prevent contamination buildup
- Avoid flat surfaces: Research shows higher disease risk on flat surfaces like bird tables where contaminated food can collect
- Provide clean water: Only offer water if you can change it daily with tap water, and clean water baths weekly
Beyond feeding practices, the RSPB and Royal Horticultural Society recommend creating bird-friendly gardens as alternative support methods. Growing plants that attract insects or produce berries can provide natural food sources while reducing dependency on feeders. Recommended plants include:
- Sunflowers and ivy for insect attraction and shelter
- Field scabious, dog rose, and lavender to attract insects
- Berry-producing shrubs like hawthorn, elder, and honeysuckle
Helen Bostock, Royal Horticultural Society Senior Wildlife Expert, notes: 'Garden birds rely heavily on the food, water and shelter found in UK gardens, making them one of the most rewarding forms of wildlife to support at home. Even small changes can make a meaningful difference to local bird populations.'
The combination of habitat loss, increased pesticide use killing insect food sources, and disease transmission at feeders has created a perfect storm for several once-common UK bird species. While the greenfinch faces the most dramatic decline currently documented, the RSPB's findings serve as a warning about the broader challenges facing garden bird populations across Britain.
