Why Do We Get Goosebumps?

The video explains goosebumps, small bumps on the skin caused by cold or strong emotions. It details the biological mechanism involving tiny muscles contracting around hair follicles. Goosebumps are compared to a goose's skin and are common in animals with fur. They help retain heat and can make animals appear larger when scared. Humans experience them similarly, though less effectively due to lack of fur.

In what situations might animals puff up their fur?

What are some other ways to keep warm or appear larger when scared?