The ABV breeding birds dataset is a sample based dataset contains more than 4500 human observation events with over 200 000 common breeding bird observations. The breeding birds project is a joint initiative of the Institute for Nature and Forest Research (INBO) and the Vlaamse Vogelwerkgroep of Natuurpunt, in collaboration with Natuurpunt Study. The data is collected to discover trends in long term breeding bird occurrences in Flanders and is used for the EU reporting on trends, distribution and future prospects of the species listed in the Annex 2 and 4 of the Habitats Directive.