Demography can be considered the key to understanding much of biology. It is the demographic processes of birth and death which govern the spread of populations through environmentsand the spread of genes through populations. An understa- ing of demographycan yield not only an understanding of population size and p- ulation change, it can help us to understand the form and function of life histories; whenorganismsmature,whentheybreed,and whentheydie. Demographicinsights allow us to see how populations function, how they interact with their changing environment, and how they adapt. The analysis of demographic processes in free-living organisms is however no simple task and involves considerable challenges in observation and analysis. Some 20yearsago,therewasaconcertedefforttopromoteinter-disciplinarycollaboration between biologists and statisticians to address these challenges and thereby to f- ther our understanding of demographic processes in natural populations. Although many diverse organisms can be studied in the wild, birds have proved particularly amenable with large numbers being marked and followed by large networks of - servers. Itwas nocoincidencethenthatthe EuropeanUnionforBird Ringing(EUR- ING) played a leading role in these initiatives, teaming up in the mid-1980swith the Mathematical Ecology Group of the Biometric Society, and the British Ecological Society, to bring together experts from diverse ?elds to address the challenges in hand. Twenty years on, progresshas been considerable and we now have signi?cant insights into demographic processes thanks to the wide range of quantitative tools and systematically collected datasets which have been built up over this period.

Population Dynamics - Growth, Density-Dependence and Decomposing ?.- Bayesian Hierarchical Models for Inference About Population Growth.- Assessing Density-Dependence: Where Are We Left?.- The Efficient Semiparametric Regression Modeling of Capture-Recapture Data: Assessing the Impact of Climate on Survival of Two Antarctic Seabird Species.- Multivariate State Space Modelling of Bird Migration Count Data.- Evolutionary Ecology.- Contribution of Capture-Mark-Recapture Modeling to Studies of Evolution by Natural Selection.- Application of Capture-Recapture to Addressing Questions in Evolutionary Ecology.- Estimating Reproductive Costs with Multi-State Mark-Recapture Models, Multiple Observable States, and Temporary Emigration.- Estimating Latent Time of Maturation and Survival Costs of Reproduction in Continuous Time from Capture-Recapture Data.- Abundance Estimation - Direct Methods, Proxies, Occupancy Models and Point Count Data.- Inferences About Landbird Abundance from Count Data: Recent Advances and Future Directions.- Sources of Measurement Error, Misclassification Error, and Bias in Auditory Avian Point Count Data.- Density Estimation by Spatially Explicit Capture-Recapture: Likelihood-Based Methods.- A Generalized Mixed Effects Model of Abundance for Mark-Resight Data When Sampling is Without Replacement.- Evaluation of the Linkage Disequilibrium Method for Estimating Effective Population Size.- Dispersal, Movement and Migration - Methods and Multi-State Models.- Migration and Movement - The Next Stage.- Stopover Duration Analysis with Departure Probability Dependent on Unknown Time Since Arrival.- Habitat Selection, Age-Specific Recruitment and Reproductive Success in a Long-Lived Seabird.- Cubic Splines for Estimating the Distribution of Residence Time Using Individual Resightings Data.- Detecting Invisible Migrants: An Application of Genetic Methods to Estimate Migration Rates.- Wildlife and Conservation Management.- Stochastic Variation in Avian Survival Rates: Life-History Predictions, Population Consequences, and the Potential Responses to Human Perturbations and Climate Change.- Filling a Void: Abundance Estimation of North American Populations of Arctic Geese Using Hunter Recoveries.- Integration of Demographic Analyses and Decision Modeling in Support of Management of Invasive Monk Parakeets, an Urban and Agricultural Pest.- Combing Sources of Information - Kalman Filters, Matrix Methods and Joint Likelihoods.- Completing the Ecological Jigsaw.- Using a State-Space Model of the British Song Thrush Turdus philomelos Population to Diagnose the Causes of a Population Decline.- A Hierarchical Covariate Model for Detection, Availability and Abundance of Florida Manatees at a Warm Water Aggregation Site.- An Integrated Analysis of Multisite Recruitment, Mark-Recapture-Recovery and Multisite Census Data.- Bayesian Applications - Advances, Random Effects and Hierarchical Models.- Bayes Factors and Multimodel Inference.- Estimating Demographic Parameters from Complex Data Sets: A Comparison of Bayesian Hierarchical and Maximum-Likelihood Methods for Estimating Survival Probabilities of Tawny Owls, Strix aluco in Finland.- Inference About Species Richness and Community Structure Using Species-Specific Occupancy Models in the National Swiss Breeding Bird Survey MHB.- Time-Varying Covariates and Semi-Parametric Regression in Capture-Recapture: An Adaptive Spline Approach.- A Further Step Toward the Mother-of-All-Models: Flexibility and Functionality in the Modeling of Capture-Recapture Data.- The Robust Design - Sampling, Applications and Advances.- Exploring Extensions to Multi-State Models with Multiple Unobservable States.- Extending the Robust Design for DNA-Based Capture-Recapture Data Incorporating Genotyping Error and Laboratory Data.- A Traditional and a Less-Invasive Robust Design: Choices in Optimizing Effort Allocation for Seabird Population Studies.- Non-random Temporary Emigration and the Robust Design: Conditi