Mark Twain said the following: "Man is the only animal that blushes. Or needs to." What did he mean when he said this? This is just for my personal curiosity as I was reading about Twain.
Samuel Clements (Mark Twain) often showed his characters in embarrassing situations caused by their own foolishness.
Clemens is saying that people can be more foolish than animals in their actions and that they should be aware of their own foolishness. He also says so in a humorous way.
Whether animals blush or not under emotional stress is probably not something scientifically tested.