Assertion: penguin's wing | /r/CapableOf | turn into flipper
Facets:
Source sentences:
text: Their wings have turned into flippers and though they usually walk upright on land, some drop on to their bellies to scoot over ice.
text: The fact is that a penguin’s wings in the process of evolution transformed into flippers, which rotate in the shoulder joint during swimming.
text: Their wings have turned into flippers, and though they usually walk upright on land, some drop on to their bellies to scoot over ice.