Celebrating birthdays is a uniquely human thing, as we are the only species who keeps track of time in that manner. Also, we simply love the excuse to treat ourselves! Perhaps that's why it's so hilariously adorable when we celebrate animals' birthdays, as they don't really understand why everyone's being so nice, yet they're certainly not complaining about their custom-made cakes and gifts given according to their tastes.
Admit it—you want to look at photos of animals celebrating their birthday. Well, click through to see photos that will make your day!