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The reproduction cycle of male Kulzer's Rock Lizard, Phoenicolacerta kulzeri, was studied in a mountain population living at 2000 m a.s.l. on Mount Sannine, Lebanon. Males showed active spermiogenesis in spring, following the renewal of the post hibernation activity, and in autumn, from September until they enter into hibernation in November. About 40% of males exhibited a short testicular regression period during the hottest months, in July and August. Relative testicular volume was correlated with male body size and varied seasonally. Males of P. kulzeri showed a more distinct reproductive pattern than the common reproductive pattern of most lacertid lizards in the Mediterranean region. [ABSTRACT FROM AUTHOR]