Assertion: tropic bird | /r/RelatedTo | other pelecaniform birds
Facets:
value: phaethontiformes
type: OTHER
value: only distantly
type: DEGREE
Source sentences:
text: Though tropic birds are traditionally classified as part of the order Pelecaniformes on the basis of morphological and behavioral characteristics, molecular genetic analyses suggest that they are related only distantly to other pelecaniform birds and should be placed in their own order, Phaethontiformes.