The White-faced Heron is a very common bird in Australia. From time to time, I would observed that their feathers are made to stand up as depicted by the photograph. I am guessing it is part of their grooming process. This photograph was taken on 1 June 2024 at Royal Park Trin Warren Tam-Boore.

Nikon Z 9, Nikkor Z 800mm f/6.3 VR S @ 1/400s f/6.3 ISO500