On Tuesday, Animal Defenders International filed a complaint with the federal Department of Agriculture asking that the elephant, Sarah, be pulled from the show because she is sick and fatigued.

The group also criticized circus organizers after they said the elephant collapsed while being transferred to a train on Sunday night in Anaheim.

"We think the circus are no places for animals. We all like entertainment shows, but we believe in human-only circus shows," said Matt Rossell, a campaigns

Sarah, the elephant on the left, was on her feet Tuesday in Ontario, but she collapsed while being loaded into a boxcar on Sunday in Anaheim. Animal-rights activists have questioned Ringling Bros.' treatment of her. (Thomas R. Cordova/Staff Photographer)
director for the Los Angeles-based Animal Defenders International.

But officials with Ringling Bros. dismissed the claims, saying the elephant was being loaded onto the ramp of a train car when she shifted her position. The elephant then backed down the ramp, causing her to lose her balance, where she kneeled and rolled down the ramp onto the ground, said Jessica Hyman, a veterinarian technician with the show.

Ringling Bros. said the allegations that Sarah is sick are false, adding the elephant has been cleared by various veterinarians since the incident.

As a precaution, officials did not have the older elephant walk to the arena on Monday.