Did the cockatiel sing during his/her stay?
They sing oh so beautifully.
I used to own one. Her name was Sunshine for the orange spots on her sides of her face. She died in my hands. I now have two parakeets, one male and one female.
No, I don't remember her singing. The first day, she sat in a box and swayed, and we were afraid she would die. Then my husband bought her a cage, and she settled in. We kept the cage on a table in the kitchen. If it was quiet and nobody was in there, she would twitter melodically to herself, but I didn't process it as "singing."
If it was busy, she would twirp and squawk. And if the cat walked through the room, she would flap and shriek, so obviously she'd lived somewhere that she'd been exposed to a cat!
We weren't sure of the sex, so we called "him" Henry. Then we got a book from the library and decided it was a she, and called "her" Henrie! The new owners liked it. I'm sorry for the people who lost her; she was a really pretty bird and had obviously been handled. We passed out "Found a Bird!" flyers in our neighborhood, but there's no telling how far she'd come before she ended up in our back yard.