Assertion: box turtle's foot | /r/CapableOf | move on the edge of her plastron
Facets:
value: forward
type: MANNER
Source sentences:
text: (3) female relaxes grip of her plastron, male slides backward to rest his shell on the ground, his rear feet move forward on the edge of her plastron, she presses her rear feet on his, he positions his cloacal opening on hers and inserts penis.