Those are four Marx Brothers birds there. Not just a broad nod either, as they refer quite specifically to one Chico’s musical routines.
Someone must not have thought that pleasant avian interaction is enough to sustain this film, since at about 4:50 the antagonistic cat shows up. This kind of antagonism is often utilized in these films, and it is often not very interesting, and I will undertake to say that every time I see it!
Not very interesting, though in this case the peril of the bird child works pretty well. So does the pretty clever rescue that resolves the whole thing.