The early Thanksgiving Day parades often had a circus orientation, and hence the animal elements. Actual lions, tigers, and bears were trucked down city streets, traumatizing them and causing the elicitation of roars and growls that frightened observing children. Wisely, the use of living animals was abandoned after a few years, with animal balloons and floats substituted, together with some great vintage cartoonish stuff that was rather surreal.
[Image and text found here; previous Thanksgiving posts here.]