A Survey: Which Museums Disallow Photographs and Why?

Since I'm still waiting to hear back from the Field Museum regarding some confusion over the no-photography policy with the Mammoths and Mastodons exhibit being run at the Anchorage Museum, I thought I'd get some input from folk who frequently visit museums and who were told, and for what reason, not to take photographs, or if the institution attempted to claim copyright ownership of photographs taken of museum exhibits.

I'd like to know for the sake of a future posting on this matter.

Photographic Texture Studies for an Early Triassic Archosauromorph

Courtesy of Zach, I was able to shoot photos of his geckos (which were largely cooperative).

I'm posting the images here for general reference. The images were shot with the same Nikon D50 I use for animation; 60 mm Macro lens, fully manual.