In Lewis Carroll's "Alice's Adventures in Wonderland," there's a quote that says, "flamingoes and mustard both bite." This line highlights the colorful and odd nature of the characters and settings Alice encounters in Wonderland. It suggests that even something as seemingly harmless as a flamingo or mustard can have a sharp or unexpected side, adding to the whimsical and unpredictable world Carroll creates.

The moral of this quote is that "Birds of a feather flock together." This phrase means that similar people or things tend to stick together or resemble each other. In the context of Wonderland, it might imply that the quirky, unusual characters are drawn to ones that share their strange qualities, emphasizing the theme of similarity and clustering among peculiar beings.