Any filament will do, chickens in the picture were printed in Wood filament.

0.20 mm layer height (eg 0.20mm speed profile) with

• 5% grid infill

• no supports

• avoid crossing perimeters

• classic perimeter generator

gave me a good result.
I rotated the model by 45°, so the infill does give extra support to the overhanging peak. 

Updated .stl to address issues with ribs in head section.