Assertion: platypus's egg | /r/HasProperty | leathery
Facets:
Source sentences:
text: After a gestation period of between two and three weeks, the female Platypus lays between one and three small, spherical eggs that are only 1.5cm in size and are soft and leathery.
text: The eggs are small (under half an inch) and leathery.
text: As monotremes, the echidna gives birth via an egg which is leathery and laid about 22 days after fertilization.