Stinkers! The Ten Smelliest Animals On Earth Pearl, 9.30pm In a tribute to olfactory assaults everywhere, this programme presents the most malodorous members of the animal kingdom, ranked from the merely disgusting to the completely incapacitating. Animals rely on scent in the way humans do on sight - for searching out food, for locating and attracting mates and for advanced warning of nearby predators. Additionally, animals use smell to signal one another, to locate migration routes and to defend against attack. Among the contenders for smelliest animal are the porcupine, fox, stink bug and musk ox. Secrets Of War Pearl, 12.50am This episode takes a look at the weapons developed by the Third Reich during World War II, including the first operational jet plane and guided smart bombs. But although Nazi weapons were far beyond anything the Allies had, their development was hampered by Hitler's arrogance. In July 1940, confident the war would be over by the end of 1941, he forbade the continuation of work on any defensive weapons or new systems that could not be completed within 12 months, temporarily putting a stop to the development of radar and guided missiles. Taboo: Drugs National Geographic, 10pm This series travels to 24 countries to investigate a diverse range of cultures and to challenge stereotypes. The first programme takes a trip from traditional acceptance to modern rejection, exploring how drugs are used in ancient cultures and why they are prohibited in modern ones. Taboo: Drugs examines three different groups of drug users: healers in northern Peru who battle demons with the help of a drug called San Pedro; Mexican children who use the drug peyote (above) for spiritual education; and Ecstasy users in the United States who break the law to explore its mind-altering effects.