We studied the survival Common hamster Cricetus cricetus in reintroduced populations (La Haye et al. 2020). The dataset contains information about observation intervals based on transmitter data collected during frequent visit to the studied populations. The study was performed in the southernmost part of the Netherlands, in the province of Limburg, in three areas: South (Amby-Heer-Sibbe; 50°50’18’’N, 5°48’32’’E), Centre (Sittard-Puth-Jabeek; 50°57’42’’N, 5°52’45’’E) and North (Koningsbosch; 51°02’41’’N, 5°57’35’’E), further referred to as areas 1, 2 and 3. These are typical agricultural landscapes: relatively open, with a mosaic of grassland, arable fields, small woods, little villages and small roads. Arable fields are approximately a few hectares in size and cereals are cultivated on 15-20% of all fields. Harvest of cereals starts at the beginning of July and continues till the first half of August. In the Netherlands the common hamster is found on arable land with loess or loamy soils, which is only present in Limburg and therefore restricting its range (Kuiters et al. 2010). In our study areas adaptive ‘hamster-friendly’ agricultural management has been established through the implementation of ‘hamster-friendly’ agri-environmental schemes (AES) on several hundreds of hectares. Hamster-friendly management implies cultivation of suitable crops on arable fields like cereals and alfalfa, in combination with harvest restrictions, giving hamsters the chance to survive and reproduce over a longer time period than on regular managed cereal and alfalfa fields (La Haye et al. 2014). This study on hamsters was strongly biased to arable fields with ‘hamster-friendly’ management, arable fields with an AES-scheme, and farmland nature reserves, because almost no hamsters live on regular managed agriculture fields anymore. Transmitters Hamsters in the wild were trapped at the entrance of their burrow from approximately the end of March until the end of October, although trapping was minimal in June-August to prevent ...