I would like to print some information on the image page only if a certain tag exists for an image. E.g. If an image is tagged as a plant, I'd like to include its endangered status.

After reading several posts, it seems I should be able to do somehing like this:

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When pages are "killed" there is always an error message. That message would be critical to understanding what is wrong.

It generate a 500 internal server error ... No errors in zenphoto debug log.

Nothing in what yo show that should cause a 500 error. Maybe it is how you inserted the code or where you inserted it.

Btw, there is an object model method for checking a tag:
http://www.zenphoto.org/documentation/classes/ThemeObject.html#methodhasTag

Again we have a documentation and try hard to name all function after what they do.

A 500 internal error I don't understand as well but on some later PHP 5 versions it might cause a notice to pass "getTags()" directly. Preferred is to first put the value into a var.

Thank you for pointing me toward the hasTag() function. This is what worked for me:

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Exactly how it should be used..;-) This works with all objects of albums, Zenpage pages and articles, too.