Question
Is there a species of prickly pear that exhibits heliotropism?  That is when the pads turn to or away from sun light.

Answer
Hello Stacey,
Almost all prickly pear, and other cacti, exhibit heliotropism. Especially in prickly pears, the pads turn to face the sun to receive more sunlight. If they are kept in a shaded area, the may try to grow towards the direction of brightness.