Birds in the EU are less abundant than a few decades ago. Since 2000, the number of common birds is estimated to have declined by 10%.

The occurrence of common birds is an indicator of biodiversity because many of them require specific habitats to breed and find food. These habitats are often also home to many threatened plant and animal species. In particular, the population of common farmland birds is in continued decline (24% since 2000). However, after many years of decline, it appears that the numbers of common birds have started to stabilise.

The population of common forest birds is even estimated to have increased by 3% between 2000 and 2020.

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