After reintroduction, the number of beavers (Castor fiber L.) has been steadily and relatively rapidly growing in some European countries. Due to the lack of research on beaver behaviour in Slovenia, we have set up camera traps for this purpose with the possibility of night shooting in the Radulja river area with its tributaries, where the beaver has been present since 2009. We observed the behaviour of the beaver family from October 2011 to January 2019. The goals of the research were to determine which behaviour is predominating at a given time of a year in different locations and what is the family’s circadian activity. Furthermore, we determined whether the distance from their lodge affects the areas they visit and the number of fell trees; and examined how different family members participate in activities as well as how often do they interact with each other. We installed camera traps in 31 different locations and gained 1832 beaver shots. We discovered that beavers spend most of their time foraging food and eating (62,4 %), along with building (12,9 %). These two behaviours are especially prevalent in winter. In the summer we recorded the most movement around their territory. Most often only one beaver appeared on the recordings, when they appeared in larger numbers, we noticed an abundance of interactions, especially mutual grooming. At the lodge the beavers were mostly engaged in construction, while most of their feeding happened on the forest paths and river banks. We established that the distance from the beaver lodge has no impact on the locations beavers visit, whilst the biggest number of fell trees is at a distance of 0-200 m from the lodge. Beavers were mostly active at dusk and at night, from 17:15 PM till 7:45 AM; and most often in the second third of the night.
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