Fig. 1.

EBFFs in Beipiaosaurus. (A) Beipiaosaurus sp. STM31-1. Arrows point to EBFFs. (B) Close-up of EBFFs in STM31-1. Arrow points to the basal end of a single EBFF. (C) Tail of the B. inexpectus holotype. Arrows point to separately preserved EBFFs, whereas most tail feathers overlap extensively. It should be noted that nearly all tail feathers are incompletely preserved in IVPP V11559 because of damage during preparation by an amateur collector. [Scale bar: 50 mm (A), 15 mm (B), and 10.5 mm (C).]