Aspen:
Online petitioners are calling on the Aspen Art Museum to cancel an upcoming exhibit by a Chinese-born artist featuring three tortoises with iPads mounted on their backs.
The exhibit by Cai Guo-Qiang called "Moving Ghost Town" is set to open Saturday as part of the public grand opening of the US town's new $45 million museum.
The African Sulcata tortoises will roam around grass on the museum's roof deck garden. Each will have two iPads showing video of three area ghost towns, which the museum says were filmed by the animals.
The petition calls the exhibit animal abuse and asks that the animals be given to a sanctuary.
A museum spokesman and the artist didn't immediately return calls.