February 29th
February 29th, it only occurs once every 4 years!
Kakapo breed only once every three to four years. Breeding season occurs in the summer, when the kakapo's favourite food trees are fruiting.
A leap year is singular--it only occurs ONE time and ONLY in that year. (One) Leap Year occurs every 4 years.
It is called Leap Year, and the day that is added is February 29th. We only get that day once every four years.
February 29, because it only occurs every 4 years.
would have to be feb 29 since it only occurs every four years
It only snows once in a blue moon. About once every few years.
every 4 years
Only once or twice in your life time, its not so, you need a booster shot once every 10 years superfuga
A leap year happens only once every four years; that is also true of US Presidential elections.
It only snows once in a blue moon. About once every few years.