org/licenses/by-sa/2.5CC BY-SA 2.5 Creative Commons Attribution-Share Alike 2.5 truetrue English lark with a green caterpillar in its beak German Feldlerche (Alauda arvensis)
the Creative Commons Attribution-Share Alike 2.0 Generic license. Attribution: Skylark (Alaudaarvensis) by Russel Wills You are free: to share – to copy