英语听力：探索发现 2013-03-10 猛玛象进城记 Mammoths to Manhattan—18
时间：2014-01-27 07:46:16
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（单词翻译）
This mass roosting takes place soon after the summer nesting season. It’s a chance for the birds to molt1 before they fly south for the winter. As Vaux’s swift numbers reach a peak in mid2 September, they attract attention from the locals. Coopers hawks3 and peregrines pluck a meal from the tumbling mass of birds. In as little as 20 minutes, as many as 40,000 swifts pack into the chimney for the night.
While a Portland chimney has become a substitute for a tree, another roosting creature has chosen a road bridge in Austin, Texas as its cave. Visitors to Austin have to wait till evening for a glimpse of what
lurks4 within the bridge.
As the sun goes down, Mexican free-tailed bats begin a breath-taking
commute5 out of the city. This
exodus6 only takes place in summer. Free-tailed bats arrive in Texas for the spring, returning to Mexico for the winter. More than a million of them leave the city at dusk and head into surrounding countryside to feed on insects. The sky over Austin
swarms7 with these aerial commuters.
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