In the 90s, the Pentagon considered developing a chemical that caused bad breath (halitosis), making it easy to identify guerrillas trying to blend in with civilians.

Cheetah cubs have long tall hair that runs from their neck all the way down to the base of their tail, which is called the mantle. The mantle makes a cheetah cub look like a honey badger and makes them blend into tall grass, which helps keep them safe from threats like lions and hyenas.