Assertion: echidna's spine | /r/HasProperty | 50 mm
Facets:
value: in length
type: OTHER
Source sentences:
text: Their sharp, creamy-colored spines are 50 mm (2 in.) in length and are composed of keratin, the same material that makes up our fingernails.
text: The spines, which may be up to 50 mm (2 in) long, are modified hairs, mostly made of keratin.