Assertion: ostrich's egg | /r/CapableOf | develop in utero
Facets:
value: for about 28 days
type: TEMPORAL
Source sentences:
text: In perhaps the best known example, the platypus, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally).