Assertion: american crow | /r/HasProperty | monogamous birds
Facets:
value: for life
type: PURPOSE
Source sentences:
text: American crows are monogamous birds and a mated pair work together to build a nest of twigs and sticks, with an inner cup lined with pine needles, animal fur, or similar soft, finer materials.
text: American crows are monogamous paring for life.