Verreuax's Eagle Owl (Bubo lacteus). Photo by Alan Van Norman.
Verreuax's Eagle Owl (Bubo lacteus) - Picture 10 in Bubo: lacteus
This is a long earred owl named Nemo. He was startled by an unusual sound. As a natural response, he immediately puffed up to a very large size in order to scare off the perpetrator. It is rare to experience this kind of reaction in an owl. Nemo went back to normal size when he discovered that the threat wasn't real.
Threat Display - Picture 5 in Owl Physiology: Behaviour
Verreuax's Eagle Owl (Bubo lacteus) - Picture 3 in Bubo: lacteus