Due to the fact that there was no quarry or marl pit before 1900, the nesting site of the first breeding pairs must have been located in a natural loess wall or in a narrow road. According to the local chronicle of Baiertal the mining activity started in small limestone quarries around Baiertal and Nussloch in 1900. Furthermore, several local farmers started an additional mining activity in seven marl pits around Baiertal in 1943. The extracted marl was sold as an aggregate for construction material and was even shipped to the Ruhr district. Due to this development and the genesis of new potential nesting sites within the marl pits the presumable repopulation of the bee-eater could be seen as a closely linked process. Therefore, the bee-eater population had grown persistently to a maximum of 10 breeding pairs by 1976. Unfortunately, this was a fateful year for the bee-eaters around Wiesloch because a bird-fancier plundered two nests within the colony. This strong intervention and disturbance caused a massive decline and finally the extinction of the colony in 1978.