Assertion: tern's egg | /r/HasProperty | incubated in turn
Facets:
value: for 41 to 55 days
type: TEMPORAL
value: by both birds
type: OTHER
Source sentences:
text: A single white egg that weighs up to 6–7% of mother's body mass is laid, and is incubated in turns by both birds for 41 to 55 days.