Assertion: river dolphin's teeth | /r/SimilarTo | the teeth of fossil whales
Facets:
value: according to a 2009 study
type: OTHER
Source sentences:
text: According to a 2009 study, the teeth of pakicetids also resemble the teeth of fossil whales, being less like a dog's incisors, and having serrated triangular teeth, which is another link to more modern cetaceans.