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Analysis of whole genomes and life-history data of male black grouse shows that deleterious mutations, especially those in promotors, reduce lifetime reproductive success.

A study of the cooperative breeding behaviour of superb starlings during 40 consecutive breeding seasons over 20 years reveals long-term reciprocal helping between both related and unrelated individuals.

Highly pathogenic avian influenza is an increasing global concern but its distribution in remote regions is not known. Here, the authors conduct an environmental influenza surveillance study in remote, uninhabited regions of the Global South by sampling fresh bird guano.

Understanding species’ spatiotemporal dynamics is key to predicting their responses to climate change. Here, the authors combine landscape genomics, demographic reconstructions, and species distribution models to assess lineage-specific responses to past and future climate in a migratory raptor.

Highly pathogenic avian influenza virus subtype H5 is an important pathogen of wild birds and poultry that has also caused infection in humans and other mammals. Here the authors use wild bird movement tracking data and virus genome sequences to quantify how seasonal bird migration facilitates global dispersal of the virus.

Analysis of crop yields, farmer income and bird species abundances identifies multiple positive outcomes of a large-scale Indian government-incentivized agroecology initiative.

The true number of human-driven bird extinctions is likely larger than we think. Here, the authors combine recorded extinctions with estimates from the fossil record to suggest that ~1400 bird species have gone extinct since the Late Pleistocene.

Twice a year, billions of nocturnal avian migrants traverse landscapes that are changing through natural and anthropogenic forces. Here, the authors identify light pollution as an influential predictor of bird migration stopover density across the USA.

The degree to which species tolerate human disturbance contributes to shape human-wildlife coexistence. Here, the authors identify key predictors of avian tolerance of humans across 842 bird species from open tropical ecosystems.

Using a 30-year dataset of North American bird species, the authors show that species’ abundances and distributions have become more decoupled from climate over time and that this is associated with ecological traits; the effect is particularly strong in threatened species.

Forecasts of risks of invasion by non-native species are challenging to obtain. Here, the authors show that mechanistic models based on functional traits related to species’ capacity to generate and retain body heat identify areas at risk of invasion by non-native birds in Europe.

Arboviruses are climate sensitive, and their global distributions are changing. Here, the authors describe results of a One Health study programme to investigate the occurrence of Usutu and West Nile Virus in the Netherlands, a previously non-endemic area.

Birdsong has long connected humans to nature. Historical reconstructions using bird monitoring and song recordings collected by citizen scientists reveal that the soundscape of birdsong in North America and Europe is both quieter and less varied, mirroring declines in bird diversity and abundance.

Direct human actions such as hunting and bird deterrence at aquaculture sites kill up to 10% of the populations of some shorebird species migrating along China’s coast each year, suggesting that this direct mortality is an overlooked threat to migratory populations.

Desert-dwelling species are adapted to high temperatures, but further warming may push them beyond their physiological limits. Here, the authors integrate biophysical models and species distributions to project physiological impacts of climate change on desert birds globally and identify potential refugia.

A dataset of the genomes of 363 species from the Bird 10,000 Genomes Project shows increased power to detect shared and lineage-specific variation, demonstrating the importance of phylogenetically diverse taxon sampling in whole-genome sequencing.

Data from three citizen science programmes on the occurrence, abundance, community structure and demography of birds across the UK show that protected areas are associated with improved state for most species and provide the most benefit to specialist, rare and declining species.

Animal diversity, measured in numbers of species, is rapidly being lost to extinction. Here, Cooke et al. show that the diversity of ecological strategies employed by land mammals and birds is also expected to narrow towards small, fecund, insect-eating generalists with fast-paced life histories.

The developing pelvis in birds revisits its dinosaurian state before transitioning to the characteristic avian form, providing evidence of terminal addition during evolution.

Over 20 species of geographically and phylogenetically diverse bird species produce convergent whining vocalizations towards their respective brood parasites. Model presentation and playback experiments across multiple continents suggest that these learned calls provoke an innate response even among allopatric species.

Interactions between European bird and plant species show that fruiting period has a major effect on seed dispersal by migrating birds, which will influence plant adaptations to climate change through latitudinal dispersal.

The evolution and systematics of Madagascar’s extinct elephant birds remains unclear. Here, the authors recover genetic, stable isotope, morphological, and geographic data from fossil eggshell to describe variation among clades, identifying cryptic diversity and potential drivers of speciation.

Sociality explains substantial variation in ageing across species, but less is known about this relationship within species. Here, the authors show that female dominant Seychelles warblers with helpers at the nest have higher late-life survival and lower telomere attrition and the probability of having helpers increases with age.

It is unclear whether bird migration patterns are restricted to interglacial periods or are maintained during glacial maxima. Somveille et al. apply a global migration simulation model to climate reconstruction to show that the prevalence of this phenomenon has likely been largely maintained up to 50,000 years ago.

Advancing phenological timing is a risk for migratory birds, particularly in the Arctic where change is most rapid. Here, the authors show that bar-tailed godwits can adjust for phenological shifts by fuelling faster at staging areas to arrive at breeding sites in time.

The transition from non-avian dinosaurs to birds capable of powered flight represents a major evolutionary transition. Here the authors analyse 48 bird genomes and identify avian-specific highly conserved elements with roles in avian limb development.

The authors combine tracking and body mass data from five migratory waterfowl species to understand their capacity to accelerate migration in response to earlier spring. They show considerable scope for faster migration by reducing the fuelling time before departure and subsequently on stopovers

Global patterns of endemism (irreplaceability) are still not well known. This study shows that endemism of birds increases from north to south, and highlights the vulnerability of southern hemisphere communities to climate change.

Analysis of soundscape data from 139 globally distributed sites reveals that sounds of biological origin exhibit predictable rhythms depending on location and season, whereas sounds of anthropogenic origin are less predictable. Comparisons between paired urban–rural sites show that urban green spaces are noisier and dominated by sounds of technological origin.