Assertion: red deer's antler | /r/HasProperty | covered
Facets:
value: during their development
type: TEMPORAL
Source sentences:
text: During their development, the antlers are soft and vulnerable to damage and covered in a grey-to-purple coloured membrane referred to as velvet.
text: While actively growing, the antlers are covered with and protected by a soft layer of highly vascularised skin known as velvet.