Assertion: echidna's spine | /r/HasProperty | hidden
Facets:
Source sentences:
text: Smaller than the Zaglossus species, it has longer hair (so long in the Tasmanian form that the spines can be hidden), more spines, and a shorter beak.
text: Their sight is poor but they are nevertheless quick enough to detect movement near them, and if disturbed by it to take protective measures: wedging themselves into any convenient hollow log or rock crevice; or dissapearing into even moderately hard soil at a surprising pace, remaining horizontal all the while until only a few spines on the uppermost portion of the back are visible; or, if on very hard, flat ground, simply curling into a ball.