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Mexican free-tailed bats are typically 9 cm (3.5 in) in length and weigh around 7–12 g (0.25–0.42 oz) with females tending to be slightly heavier than males by 1–2 grams for increased fat storage to use during gestation and nursing. [8]
The bats reside beneath the road deck in gaps between the concrete component structures. They are migratory, spending their summers in Austin and the winters in Mexico. According to Bat Conservation International, [3] between 750,000 and 1.5 million bats reside underneath the bridge each summer.
An estimated 20 million Mexican free-tailed bats roost in the cave from March to October making it the largest known concentration of mammals. [ 1 ] The cave and undeveloped 1,521 acres (616 ha) around it are owned by Austin, Texas -based Bat Conservation International , which restores the land to support native vegetation and an abundant ...
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The Ann W. Richards Congress Avenue Bridge over Lady Bird Lake houses the world's largest urban bat population. When the bridge was refurbished in the 1980s, the new design created crevices underneath the structure that happened to be ideal for bats to roost in. In the summer, the colony has up to 1.5 million Mexican Free-tailed Bats.
The dental formula of free-tailed bats varies between species: 1.1.1-2.2-3 1-3.1.2.3 Free-tailed bats are usually grey, brown, or black in color, with some exceptions. They range from 4 to 12 cm (1.6 to 4.7 in) in length, excluding the tail, and can weigh from 8 to 220 g (0.28 to 7.76 oz), depending on species.
The Ann W. Richards Congress Avenue Bridge, which crosses over Lady Bird Lake in Austin, Texas, is the world's largest urban bat colony. Seventeen species of bats live in the Carlsbad Caverns National Park, including a large number of Mexican free-tailed bats. [1]
Celebrate Mexican Independence in Austin with free events with folk dancing and mariachi. ... In Austin, the day celebrates the cultural heritage of Mexicans and Mexican-Americans within the ...