When Ting Ting the sun bear arrived at the Oakland Zoo in 2006, she had a spacious field to explore. But Ting Ting confined herself to a raised wooden plank. Ting Ting, rescued from the illegal wildlife trade where she was sold as a pet, was previously kept in a small cage where she could walk only a few steps back and forth. In her first months at the Oakland Zoo, she maintained the same pacing pattern. The Oakland Zoo…