Observations on the reproductive behavior of captive Tadarida brasiliensismexicana (Chiroptera : Molossidae)

Descriptions of distinct behaviors and vocalizations associated with mating are avail ar observations have not been reported for the Mexican free-tail ed bat (Tadarida brasiliensis mexicana). In this paper, we describe the seq uence and timing of scent marking activity territorial defense, and vocaliz ations associated with pre-mating activity for two captive colonies of this species. Males in these captive colonies' developed a distinctive odor and marked territories by rubbing secretions from their gular glands on surfac es of cages. These males demonstrated an obvious affinity for particular lo cations within the cage and appeared to defend these areas, both vocally an d physically against intrusion by other males. Two types of audible vocaliz ations were noted in relation to pre-mating activity by these males. The fi rst was a buzz that may have been used to announce establishment of mating territories and to call females to these areas. The second was a faint chir ping vocalization that may have functioned as a mating song or perhaps an i ndication of more immediate sexual intent.