NRDC (Natural Resources Defense Council) commissioned Grey Beijing to develop a print advertising campaign warning about global warming’s impact on polar creatures. “Take global warming seriously before its too late”. Retouched photographs show a polar bear catching salmon, a walrus in what would normally be a hippopotamus environment, and a penguin riding the back of a hippopotamus.



Credits
The campaign was developed at Grey Group China, Beijing, by executive creative director Chee Guan Yue, creative director Adrian Zhu, art director/copywriter/reotucher Zhi Guo Zhou, art director/copywriter Gang Zhao, retoucher Bin Bin Zhang.

Just for clarities sake, that is a walrus not a sea lion, and that is a hippopotamus not a crocodile.
You’re right.