Assertion: penguin's feather | /r/HasProperty | outer
Facets:
Source sentences:
text: Overtop of this they are covered with fluffy “down” feathers and overtop of those they have their outer feathers which overlap to seal in warmth.
text: On top of this they are covered with fluffy "down" feathers and on top of those they have their outer feathers which overlap to seal in warmth.
text: Their outer feathers are interlocked, and prevent water from getting into the downy feathers near their skin.