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Session Description: Animal populations are an important unit of evolution since natural selection and genetic drift cause shifts in allele frequencies in populations and therefore lead to evolution. It is consequently of upmost importance to know at least the basic metrics of populations such as population size, longevity, age structure and survivorship to understand and predict changes in populations and act appropriately to preserve biodiversity in a rapidly changing world. Unfortunately, we know astonishingly little about the populations of arthropods, the most diverse taxon on the planet and a key element of the flow of energy and matter through all ecosystems. One of the best methods to identify the key properties of populations are capture-mark-recapture (CMR) studies, also known as mark-release-recapture (MRR) studies. The low number of CMR/MRR studies of arthropods are partially due to the challenges to reliably mark or tag arthropods. Quite recently there are, nevertheless, a number of studies using traditional and innovative methods to eluate the hidden features of arthropod populations. This workshop aims to collect the best of them and inspire others to contribute to the much needed research focus on arthropod populations.