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In the field of biodiversity research, tree-related microhabitats in the temperate zone have received substantial interest in the last decade, but one particular microhabitat type, crown microsoils in tree crotches, has largely escaped the attention of scientists. We present a study from Central Europe that focused on the meso- and macrofauna in this microhabitat type. In twelve crotches we found more than 3000 individual animals out of 14 orders, encompassing all major elements of the terrestrial soil decomposer food web. Collembola accounted for more than 50% of the total. As expected, taxon richness correlated with habitat size. We conclude that this is an ideal natural system to study fundamental ecological questions of faunal community assembly.