Humans have to give up their formula habit when they reach a certain stage of development, but it's perfectly acceptable for animals to hit the bottle at all ages or hours of the day. If you are in need of a midday smile, drink up these touching pictures of cuties quenching their thirst. Sometimes you gotta let loose and party like an animal.
Taking Sips With a Designated Drinking Partner
A keeper offers a bottle of milk to a newborn white rhino at the zoo in Germany while mama looks on. The rhino is just one day old in this picture!
Bottle Service For the Whole Crew!
A 26-day-old endangered Sumatran Tiger cub paces past the human keeper as she feeds two baby Orangutans.
An animal trainer feeds Odin, a five-year-old White Bengal Tiger who doesn't like to get wet and jump in the water to retrieve meat.
Sip Slow, Now!
A Siberian tiger cub takes big gulps from a bottle at the Hengdaohezi Breeding Center for Felidae in Harbin of Heilongjiang Province, China.
That Glazed Over Milky Look
A baby white tiger is fed with a bottle at the zoo in the German town of Aschersleben.
Sipping With a Star
Desperate Housewives star Marcia Cross  bottle feeds a rescued California sea lion pup at SeaWorld San Diego.
Nursing For Survival
An Israeli veterinary feeds eight-day-old baby giraffe Darwin, who has a problem in his legs and can't suckle from his mother.
Breakfast of Champions
World and Olympic sprint champion Usain Bolt feeds a cheetah cub with a bottle at the headquarters of the Kenyan Wildlife Service in Nairobi.
Don't Worry, It's Medicine
A vet gives medicinal drugs in a Coke bottle to a 50-year-old chimpanzee in Abidjan zoo.
Feeding With a Careful Caretaker
A zookeeper feeds a baby Francois, a leaf monkey, whose mother died after its birth.