The Oscar winner, who is a Greenpeace activist, admits the work she had to do for Rust & Bone at a Maryland Sea World made her sick.
She tells C magazine, ""I'd rather see whales in their own environment and not in a swimming pool. I will never go back to a Sea World.""
Cotillard adds, ""I really feel uncomfortable in these places, where animals are kept in captivity, so when I got there, I was really anxious, but then I had to do the job and I met these people who are passionate about what they do. I respect them but I will never understand.""