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Listen to an Announcement Test #204
Listen to an Announcement
1. What is the professor mainly discussing?
A) The negative effects of city noise
B) A new method for studying birds
C) An observed adaptation in urban birds
D) The differences between bird species
2. Why are the birds' songs changing, according to the hypothesis?
A) To attract different types of mates
B) To communicate over longer distances
C) To be heard above urban noise
D) To copy sounds from the city
Professor: I want to share a fascinating finding from a recent study on urban wildlife. Researchers discovered that certain bird species in cities are developing higher-pitched songs compared to their counterparts in rural areas. The leading hypothesis is that this is an adaptation to be heard over the low-frequency noise of city traffic. Essentially, by singing in a higher key, their calls are less likely to be drowned out. This demonstrates just how quickly some species can adapt to human-made environments.
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