sentence: Modern turtles possess a horny beak without any teeth in their mouth.
sentences_before: As a primitive turtle, 'Odontochelys' differed from modern turtles in several ways.
sentences_after: In contrast, 'Odontochelys' fossils had teeth in their upper and lower jaws.
concept_name: modern turtle
headings: Odontochelys
categories: Turtles Marine reptiles