This dataset contains information of 421 records of Arvicola sapidus and records of other small mammals distributed in Ribera Alta (Navarra, Spain). All specimens were collected for studying the biology of A.sapidus. The collection includes skeletons, skins and in some cases, tissues from this specie. There are included also skulls and skins from few other species of small mammals trapped during the surveys. The data set is available in GBIF.