BTO Research Reports are scientific papers that have been self-published by the BTO. The following is a full list of the published BTO research reports. Most are free to download, and links to ...

The go-to species for personality research has, more often than not, been the easy-to-study Great Tit. Great Tits can’t be asked to fill out a questionnaire or to undertake a psychometric test, and so ...

The American wood warblers are similar in in size, shape and habits to the old world warblers, to which they are not at all related, though they are generally rather more colourful, particularly the ...

Frigatebirds are highly maneuverable aerial predators of tropical waters. The five species all breed in large colonies in trees on tropical islands. During courtship the males (which are mostly black) ...

The vireos are a group of migratory warbler-like birds of the Americas. Birds of the tree canopy, they have relatively dull plumage, a robust build and heavy bills. Although they feed largely on ...

As the name suggests, the three species of Tropicbird are usually to be found wandering the tropical oceans. They are very distinctive white birds with two long tail streamers. Their supposed ...

Perhaps the most graceful of seabirds, their buoyant flight and long tail-streamers means they well deserve their alternative name of sea-swallows. Found throughout the world, they are summer visitors ...

‘Biodiversity’ describes the variety of life in an area. It can be measured in areas as small as a back garden and as big as the entire Earth, and encompasses everything from genetic diversity and ...

In addition to the formal trends and research papers that emerge from analysis of BTO Garden BirdWatch data, we also present data summaries for the core species that we monitor, together with basic ...

This small family of waders is charcterised by slender bodies and long wings; the pratincoles also have very short legs. They are charcteristic of open semi-desert habitat in Africa, Asia and ...