Fig. 2.

Unusual skeletal features of Balaur bondoc. (A) Posterior dorsal vertebrae exhibiting the stalk-like parapophyses characteristic of dromaeosaurids and extensive pneumatic chambers filling the neural arch. (B) Left hindlimb, showing the fused tibiotarsus, fused and stout tarsometatarsus, large digit I comprised of enlarged individual phalanges, and hyperextensive capabilities of digits I and II. f, fibula; mt, metatarsal; pa, parapophysis; pl, pneumatic foramina; pneu, pneumatic cavities; t, tibia.