Non-native American mink (Neovison vison) is a widely spread predator in Denmark. The feral population in mainland Denmark consists of captive-born mink that escaped from fur farms and wild mink born in nature, whereas the population on Bornholm is almost all wild-born mink. In this study, the diets of feral mink in mainland Denmark and on the island of Bornholm are analyzed. The aim of this study was to examine (1) whether the diet of the larger captive-born mink differs from that of the smaller wild-born mink, (2) assess the regional variations between the diets of mink in mainland Denmark and on Bornholm, and (3) investigate the seasonal variation in the diet composition of mink. The stomach contents of 364 mink (243 wild-born and 114 captive-born) culled in the years 2019–2022 were analyzed. Of these, 203 mink were from mainland Denmark, and 154 were from Bornholm. No significant differences were found between the diets of captive-born mink and wild-born mink or the mink found in mainland Denmark and on the island of Bornholm. Significantly more empty stomachs were found during spring than during the summer and autumn, suggesting a bottleneck in the diet during spring.

Elephants’ nocturnal behaviours are an important part of their welfare in captivity. For this reason, this study investigates whether the nocturnal behaviour of three African elephants’ (Loxodonta africana) in Aalborg Zoo is affected when exposed to different conditions and if they are affected differently.  Camera footage was used to log the elephants’ behaviours at night during a control period and during two periods with different impacts, which consisted of six nights respectively. Every night, the elephants were captured on video from 8 pm to 8 am and the behaviours were subsequently logged every second following an ethogram containing seven behaviours. This study was not able to show an effect (p > 0.05) on the elephants’ nocturnal behaviour related to an increase in visitor activity during the Autumn holiday. However, a significant increase in the duration of the sway behaviour was found after the shift from daylight saving time to standard time. This study also found that the elephants show individual norms within the behaviours such as interaction with food and abnormal behaviours. The lack of statistical evidence for changes in nocturnal behaviour related to visitor activity, may be due to other external factors influencing the nocturnal behaviour of the elephants. Swaying behaviour was affected by the shift to standard time of all three elephants. Individual differences in nocturnal behaviours indicate that the three elephants have different animal personalities.