License: Public domain
Original Size: 3264 × 2448 pixels
Description: Mute swan (Cygnus olor) wearing a metal ring on its left tarsus.
Bird ringing Cygnus olor
License: Public domain
Original Size: 3264 × 2448 pixels
Description: Mute swan (Cygnus olor) wearing a metal ring on its left tarsus.