Yes. But the other children were only children, and they were pretending to be animals.
7 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.
You can hear this line at 00:38:32 in the Blu-ray version of the movie.
Quote context
[...]
- And I said, I'm not an animal. I'm a girl.
- And he said, Only animals allowed here. Good-bye. So I came upstairs.
- Why didn't you tell him you were a lion or a bear?
- Because I'm not a bear or a lion.
- Yes. But the other children were only children, and they were pretending to be animals.
- But that's what makes the game so silly.
- Do you know what the imagination is?
- Oh, sure. That's when you see things, but they're not really there.
- Well, that can be caused by other things too.
[...]