The June 22 1907 Toronto Globe had two ads featuring the Curzon Sisters, also known as the Human Butterflies or Flying Butterflies. They travelled through the air supported by slender wires attached to their teeth and performed a “serpentine dance”. Here’s the two ads:
I couldn’t find much about the Curzon Sisters. The ancestry.com website has some pictures of the sisters linked to Pearl Kalar (1882-1979), who might have been one of the sisters. But you have to register to view more, and I didn’t want to do that.
1907 was the first year of the Scarboro Beach amusement park; it closed in 1925. BlogTO has more details.