Assertion: tern's egg | /r/HasProperty | incubated by the male
Facets:
value: for about 25 - 31 days
type: TEMPORAL
Source sentences:
text: The average clutch consists of one to two eggs, which are incubated by both the male and female for about 25 - 31 days.
text: The emperor penguin’s single egg is incubated by the male, who keeps it warm on his feet while being battered by fierce Antarctic storms.