Which Animal excretes red sweat in anger?

The hippopotamus is known to excrete a red sweat in anger. This sweat is actually a pigment called "blood sweat" that is produced by glands in the hippo's skin. The sweat is red because it contains a high concentration of iron oxide, which is also found in blood. When the hippo is angry or stressed, these glands release the sweat, which turns its skin a reddish-brown color. This is thought to be a warning signal to other hippos that the animal is feeling threatened and ready to defend itself.