From the Super Mario Wiki
Bamboo Dancers are a subset of Spear Guys that prefer playing "limbo". While Dancing Spear Guys jump around with spears, Bamboo Dancers always come in color-coded pairs and dance with limbo sticks. Their stick can trip Yoshis and lower their happiness, so it must be jumped over to avoid damage. During gameplay, one dancer is in the foreground while the other is in the background, making them invincible.
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