A、The songbirds have transparent legs. B、The songbirds dance very quickly. C、The songbirds often hide behind the leaves. D、The s

Scientists have discovered the speciesof songbird that performs a tap dance so fast thatit can’t be seen by the naked eye of human beings.Researchers from Japan and Germany slow down footage of the blue songbirds during courtship.Here’s our science reporter Jonathan Web.“Now, they’ve discovered that tap dance isin the course of courtship of both maleand female blue songbirds.This is very obvious in the process of the songbirds expressing love to each other.The next step for the researchers isto discover the relationship between courtshipand this fancy footwork,such as whether the bird’s mate is courted by the sight,the sound or the vibrations of this fancy footwork.Such is the agility of the songbirds’show-stopping quickstep that could only be fully appreciated in super slow motion.”That’s the latest BBC news.
Questions 1 and 2 are based on the news report you have just heard.
1. Why does the naked eye seldomsee the dance of the songbirds?
2. What should the researchers do next?