Pig bladders were used in the 19th century to store an artist’s paint. The bladder would be sealed with a string and then pricked to get the paint out. This option wasn’t the best because it would often break open. American painter John G. Rand was the innovator who made paint tubes from tin and screw cap in the 19th century.
Wild monkeys do eat bananas, but the bananas that monkeys are fed in zoos are cultivated for humans to have more sugar. These bananas are just too sweet for primates. Head of Conservation and Advocacy at the Paignton Zoo, Dr. Amy Plowman, says that giving the bananas to monkeys is like feeding them cake or chocolate.