The horns of the great horned owl are actually feathery ear tufts known as…

A Cresticorns
B Quillicorns
C Plumicorns

The owl’s distinctive tufts of feathers are known as ‘plumicorns’ and start growing shortly after they hatch. Beyond having a delightful name, they’re thought to be used to show expression and for camouflage.

The correct answer is Plumicorns.