Expressive Faces vs. Expressive Bodies

Idea: Humans use facial expressions heavily; animals often rely on full-body movements.

Explanation:

Humans frown, raise eyebrows, or smile. Chimps show teeth in aggression (not smiling). Dogs wag tails, cats arch backs — the whole body becomes a communicator. Animals don’t mask emotions as humans do (e.g., fake smiles), making their expression more honest but harder for us to read. This teaches us: Understanding emotion needs observing beyond the face.