yes
Yes, a bird will usually sing when it hears another bird. We have a parakeet and when we whistle she answers.
It is like leaving a mark for their territorry, so it would be like urinating on trees.
And Your Bird Can Sing was created on 1966-04-26.
Yes it can sing
Either one of them can whistle or sing, if they enjoy doing so.
no
yes they have to sing!
Yes.
they sing
No.
a bird
Yes