 Ivo Hodek has also described the species as univoltine (having one brood per year); in early autumn they migrate from sun-exposed forest habitat “to well-insolated slopes of rocky hills or also to buildings.” Seeking winter shelter in rocky crevices or, opportunistically, in human dwellings, the beetles will cluster in aggregations of up to several hundred individuals.Hodek notes that by clustering together they maintain a temperature “much higher than ambient” and that in the spring the adults mate and disperse.The Prodigal Son (1934 film)

The Prodigal Son (German