I want to know the answer to the following question:
Avian species such as Anchiornis huxleyi and Xiaotingia zhengi are from which time period?
All the background I'm provided with is that "The avialan species from this time period include Anchiornis huxleyi, Xiaotingia zhengi, and Aurornis xui.". Is that enough to answer the question?
Answer: no