Mexican free-tailed bat
（重定向自Tadarida brasiliensis）
![](/Images/godic/202502/14/Tadarida_brasiliensis1441.jpg")
![](/Images/godic/202502/14/Tadarida_brasiliensis_Range1441.png")
![Bats flying near Frio Cave in Concan, Texas](/Images/godic/202502/14/Free-tailed_bats1441.jpg")
![Mexican free-tailed bats, emerging from Carlsbad Caverns, Carlsbad Caverns National Park, New Mexico](/Images/godic/202502/14/Tadarida_brasiliensis_outflight_Hristov_Carlsbad_Caverns1441.jpg")
The Mexican free-tailed bat (Tadarida brasiliensis), also known as the Brazilian free-tailed bat, is a medium-sized bat that is native to the Americas, regarded as one of the most abundant mammals in North America. Its proclivity towards roosting in huge numbers at relatively few locations makes it vulnerable to habitat destruction in spite of its abundance. The bat is considered a species of special concern in California as a result of declining populations.