Archaeologist Cédric Gobeil discusses how he used modern imaging technology to find dozens of animals tattooed on the mummy of an Egyptian woman, probably a priestess of Hathor. She also had a hieroglyphic neck tattoo that is pretty creepy-looking 3,300 years later.
In addition to snakes, she has lotus flowers and cows inscribed on her skin. According to the Gobeil:
Some parts of the body are so dark and covered in embalming product that it's impossible to see the skin. So using an infrared camera, it sees through layers and sees skin as it was.