What are blue birds known to do?
Options:
- spread wings
- sing songs
- pick berries
- lay eggs
- scream Let's think step by step:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Blue birds are known for their sweet musical voice. When birds communicate in their sweet musical voice, it is considered as singing songs. So, the answer is sing songs.