Assertion: trumpeter swan's egg | /r/HasProperty | incubated for 29 - 30 days
Facets:
value: for the bewick's swan
type: PURPOSE
Source sentences:
text: The female lays 2 - 7 creamy white eggs (usually 3-5), which are incubated for 29 - 30 days for the Bewick's Swan and 30 - 32 days for the Tundra / Whistling Swans.