What prominent physical features on the Eurasian Eagle-Owl's head are explicitly stated to be feathers, not actual ears?
Answer
Prominent ear tufts
The bird is instantly recognizable by its prominent ear tufts, which are noted to be feathers and not actual ears.

Related Questions
Where is the core native distribution of the Eurasian Eagle-Owl primarily centered?What is the approximate maximum wingspan measurement reported for the Eurasian Eagle-Owl?What prominent physical features on the Eurasian Eagle-Owl's head are explicitly stated to be feathers, not actual ears?Which spectacular, large native owl species in North America fills a similar ecological niche?Why do many North Americans have the opportunity to see the Eurasian Eagle-Owl up close?What is the typical body length range the Eurasian Eagle-Owl can reach?Which of the following prey items is mentioned as part of the Eurasian Eagle-Owl's broad diet?What is the primary ecological role the Eurasian Eagle-Owl occupies in its native range?What is the approximate weight range cited for adult males of this species?If a wild Eurasian Eagle-Owl sighting were ever confirmed in North America, how would it almost certainly be classified?