Have Bird Questions? Ask a Bird Specialist.
Hello, Dr. Pat here. Thank you for requesting me.
The answer could be yes either way, or both.
How long have you had the bird, and how do you have the cage set up?
The bird may not quite be comfortable yet. I would not be too worried for about a week, or even longer.
If the bird was out in the environment for a while, it may have been exposed to pathogens or severely stressed. Either way, the immune system could be impacted and suppressed. The song is the first to go if a canary does not fell 100%, it will not sing. It would be worth a trip to a good bird vet for an exam and even some testing. It is hard to know what the little has been through.