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Nocturnal and siesta resting ecology and behaviour of 24 Egyptian mongooses were studied. Mongooses mainly used underground dens (rabbit warrens and badger setts) and thickets in both periods. Tree hollows were occasionally used. Twenty-one individuals used 338 different nocturnal resting sites on 672 occasions. Mean number of resting sites per individual was 16.1, though resting sites used by each individual increased when sample size did. Mean re-use rate was 1.99 nights/site. The majority of nocturnal resting sites were only used once, and very few more than five times. Nocturnal resting sites used two or more times were significantly more often inside than outside home range core areas, whereas resting sites used once were significantly more often outside than inside. Mean distance between consecutive nocturnal resting sites was different among classes of individuals, and annual variations were detected. Eighteen mongooses used 133 different resting sites on 171 occasions during siesta periods. Mean number of different sites used and re-use rate were 7.4 and 1.29, respectively. Types of resting sites used during siesta periods changed throughout the year with underground dens predominating in summer. Re-use rates remained constant for the whole year. The impacts of social structure and summer high temperatures on mongoose resting behaviour are discussed.