6 greenfinch facts you need to know

Discover 6 fascinating facts about the BTO September Garden Bird of the Month.

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Greenfinch at a bird feeder.
© Jill Pakenham/BTO

 

1 Woodland bird

Originally greenfinches were confined to areas of woodland, or forest edges, and rarely ventured out into farmland or human habitation. While this is still the case in parts of continental Europe, here they started to visit gardens in the early 1900s, potentially as food provision in gardens increased.

2 Irregular migrants

Most of the greenfinches that breed in the UK are sedentary, seldom moving far. A few, however, will travel much longer distances, spending their winters in Ireland or continental Europe. Individual birds may behave differently in different years, which suggests that the movements are driven by high breeding densities or food shortages during late summer, rather than annual weather conditions.

3 Nesting habits

While greenfinches usually pair from late February, you may hear males singing as early as January. They often nest in loose colonies of four to six nest. Birds nesting in gardens where food is provided throughout the year appear to breed slightly earlier than pairs that nest outside of gardens. The young are fed on a regurgitated mix of seeds and insects.

4 Seed eaters

Greenfinches rely on seeds and their large bills allow them to be able to eat a wide variety. They show some preference for seeds held within fleshy fruits, such as rosehips, though often ignore the fruit and just eat the seed. During the autumn, seeds from yew and hawthorn are important, and in the winter, bramble. In gardens, they like sunflower seeds, whether they are black or hearts.

Female greenfinches are duller than males but still have yellow wing flashes. © Jill Pakenham/BTO

5 Deadly disease

Until the 2005, greenfinches were one of the most common birds at our garden feeders. However, hit by the disease finch trichomonosis, they are now a rarity in many gardens and their population has declined by about 35 per cent. Trichomonosis can be spread between birds at garden feeding stations so it is very important to regularly clean feeders and bird tables.

6 Different shades of green

Greenfinches are about the size of house sparrows. Males are dull-olive green with greenish-yellow on the breast and rump, and have bright yellow wing flashes. Females are duller in appearance, with less yellow in their plumage. Juveniles are paler overall, and have streaked plumage.

Learn how to tell our garden ‘green finches’ apart by watching this BTO ID video. 

The British Trust of Ornithology (BTO) works in partnership with over 40,000 volunteer birdwatchers to chart the fortunes of UK birds.

Among the surveys that we coordinate is our popular Garden BirdWatch, the largest year-round survey of garden birds in the world.

Each month we highlight a bird for you to look out for in your garden.

For more information about Garden BirdWatch or to speak to the Garden Ecology Team please email gbw@bto.org

 

Read previous BTO Garden Bird of the Month blogs.

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