This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue

For now, here's a copy of the image, and I'm releasing use of this low resolution version to the commons under the following non-commercial license:

https://creativecommons.org/licenses/by-nc-sa/4.0/

An appropriate caption might be:

"The unique dorsal fin of J2 Granny, showing her half-moon notch."

If you need/want to add more: This photo was taken as she swam through Haro Strait in Washington State in 2007.

And I guess there will be a link somewhere on the commons page, too?

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Unfortunately, that license is not compatible with wikipedia. You selected the non-commercial license, but wikipedia requires commercial licensing (as people can resell wikipedia, oir printed books using wikipedia content, etc).

Are you willing to release under the commercial license?

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Sure, I'm willing to release it under the following license:

https://creativecommons.org/licenses/by-sa/4.0/