The elephant was having trouble because his ears were wilting, his eyebrows were arched, and his eyes were wide open. He was building his confidence, which shows that he was concerned with crossing the bridge. The elephant looked down, tested the bridge, stepped carefully, and stretched as far as he could go without letting go of the post. Also, the elephant wanted to make himself feel better when he said that the bridge had to be made for elephants. Finally, the elephant was breathing heavily all throughout the clip.