Sorry to add a touch of seriousness to this, Sass, but why do you think that he does not own the copyright?
I am under confusion about the copyright. When I worked in the Labs we were encouraged to create and invent ways of making the work and tests easier. He posted the picture on a public internet and therefore it should have had had a copyright preventing others reposting it.
I am not sure how he did one without the other. If he did not copyright his work before posting then he prevented himself from allowing himself to exercise authority over who could and could not repost his work.
The KJV of the bible has no copyright...so can be reposted in large chunks. Other versions cannot.
To prevent others reprinting it.
He owns a picture automatically if he took it. But as in law the laws of men do not apply to animals, I see no way he could be in the position he claims to be. The subject of the picture could not legally give permission so does the owner of the subject say they own the copyright? The way I look at it, the person who took the picture owned the materials and took the shot. Unless they can establish it was somehow illegal to do so, ( sign saying no photographs to be taken) then I HONESTLY see no way copyright can be a problem.