From England to Northern Ireland, Scotland and Wales, BTO welcomes everyone to get involved wherever they are—and works to make sure its monitoring projects cover the whole of the UK.

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Biology Lifecycle and body size information for Long-tailed Tit, including statistics on nesting, eggs and lifespan based on BTO ringing and nest recording data.

The heart of BTO encompasses three key areas: birds, science, people. We work to secure a better future for birds and nature, using our science, monitoring and data to inform good environmental …

BTO collects, analyses, reports on and offers a wide range of data including facts and figures on British birds (including bats and butterflies), trends in numbers and breeding performance over 50 years and …

It applies to all BTO activities, whether online (including meetings and events, telephone, letter, and email) or offline (any face-to-face interaction). We've also written some guidance for volunteer …

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Birdfacts is based on data collected by volunteers participating in surveys that are organised and funded by BTO, RSPB, Esmée Fairbairn Foundation, JNCC and other partners.

BirdFacts provides up-to-date information on the status and ecology of birds in the UK, drawing on information collated by BTO and partner organisations through our citizen science surveys and …