Task: Sentence Expansion
Input (English): Whereas other theropods walked with three toes on the ground , fossilized footprint tracks show that most dromaeosaurs held the second toe off the ground , with only the third and fourth toes bearing the weight of the animal .
Output (English): However , whereas most theropods walked with three toes contacting the ground , fossilized footprint tracks confirm that many early paravian groups , including the dromaeosaurids , held the second toe off the ground in a hyperextended position , with only the third and fourth toes bearing the weight of the animal .