Working as a zookeeper requires you to be passionate about animals and wildlife conservation. You often spend more time with the animals than other zoo employees, getting to know their habits and personalities. This helps you determine when the animals are healthy or whether they need veterinary care, a vital role of primary caregivers.
So on average the number of days between two similar phases (e.g. between one full moon and the next full moon) is about 29.531 days. This period is referred to as a lunation, lunar month, or synodic month.
A second full moon in one calendar month is usually called a blue moon and this occurs approximately every 3 years. The saying Once in a blue moon refers to something that does not happen often (like a blue moon.) However, a blue moon can also refer to the third full moon in a season with four full moons.