Species fact sheet by Global Register of Migratory Species - www.groms.de
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Tadarida brasiliensis (I. Geoffroy, 1824)
Synonym:
Family: Molossidae
Order: Chiroptera
English: Brasilian free-tailed bat
French: Chauve-souris à queue-libre du Mexique
Spanish: Rabudo mejicano
German: Brasilianische Bulldogfledermaus (There's a German version of this page!)
Norwegian: Brasiliansk bulldoggflaggermus [?],
brasiliansk frihaleflaggermus [?] (There's a Norwegian version of this page!)
Migration: intercontinental
Regions: [...]
CMS: App I
CITES: NL
RL1996: LR/nt
RL2000: LR/nt

map about the distribution of Tadarida brasiliensis 

“The Brasilian free-tailed bat (or Mexican free-tailed bat) is widely distributed over the Americas, exhibiting high genetic variability between isolated populations. For North and Central America respectively, 11 subspecies have been described (Hall 1981). This species occurs in large caves in Texas, New Mexico and Arizona in aggregations of up to 20 million individuals. Most investigations on migration have been made in this area. Seasonal return migrations of up to 1,300 km have been shown for marked individuals from Arizona. Sexual segregation is pronounced: males initiate their shorter southward migration in autumn before females, which cover much larger distances (Baker 1978).
The summer population at Carlsbad Caverns, New Mexico, declined from an estimated 8.7 million in 1936 to 200,000 in 1974; thereafter, it recovered to approximately 700,000 in 1991. The decline has been attributed primarily to organochlorine pesticide contamination and habitat disturbance. Similar declines have been observed in other populations of this species (Thies et al. 1996).”
Riede, K. (2001): Global Register of Migratory Species. Weltregister wandernder Tierarten. Münster (Landwirtschaftsverlag), p. 177

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by Ansgar Tappenhölter