Assertion: tawny owl's egg | /r/HasProperty | incubated for about 30 days
Facets:
Source sentences:
text: Lays 1 to 4 white, oval, slightly glossy eggs, which are incubated for about 30 days.
text: The eggs are incubated for about 31 days.
text: After the eggs have been incubated for around 30 days, the frogmouth chicks hatch out and are covered in downy feathers.