Assertion: petrel's underside | /r/HasProperty | more uniform than giganteus
Facets:
Source sentences:
text: The underside of older halli is paler and more uniform than giganteus, the latter showing a contrast between paler head and neck and darker belly.
text: The underside of older M. halli birds is paler and more uniform than M. giganteus, the latter showing a contrast between paler head and neck and darker belly.