The Greenfinch was added to the UK Red List of conservation concern in 2021 due to a severe population decline of over 65% in the last three decades. This rapid drop is primarily caused by the spread of the disease Trichomonosis, which has severely impacted their population, particularly since the mid-2000s. BTO.org +3

Key Facts About the Greenfinch Decline

• Status: Red Listed in the UK (highest conservation priority) as of 2021.

• Cause: A parasitic disease called Trichomonosis, which causes lesions in the throat and prevents eating, is the main culprit.

• Decline Numbers: The population has crashed, with local breeding populations in some areas falling by as much as 20% in specific periods.

• Impact on Populations: Once a very common garden bird, they are now rarely seen in many areas.

• How to Help: Ensure bird feeders and tables are cleaned regularly with disinfectant to stop the spread of the disease.

• European Status: While red-listed in the UK, the European Greenfinch is classified as 'Least Concern' on a global scale by BirdLife International, as the overall European population is still large.