Assertion: blue whale's migration | /r/HasProperty | lengthy
Facets:
Source sentences:
text: They often spend summers feeding in polar waters and undertake lengthy migrations towards the Equator as winter arrives.
text: They generally spend summers feeding in polar waters and undertake lengthy migrations towards the Equator as winter arrives.
text: They often spend summers feeding in polar waters and undertake lengthy migrations towards the Equator before the winter.
text: They often spend summers feeding in polar waters and undertake lengthy migrations towards the Equator as winter arrives.