According to text, songbirds

01) are in danger of extinction due to an epidemic illness that affected their vocal organ.

02) may find it difficult to live in town centres because of noise pollution.

04) suffer the consequences of traffic noise mainly in their communication.

08) are not able to procreate in urban areas or human-affected environments.

16) do not choose developed areas as their natural habitat, but rather look for green zones in the countryside.