Taronga Zoo has had an unexpected addition with a female wallaby giving birth to a joey after apparently being celibate for a year.
Keepers were left stumped when they saw the joey peeking out of female Mica's pouch because her last contact with mate Sam was in March, 2015.
And that rendezvous resulted in a birth weeks later.
According to the zoo it's possible the two secretly mated again and Mica put the baby on hold in her womb for more than a year using a survival mechanism known as embryonic diapause.
The phenomenon, which usually occurs during drought, allows mothers to delay the development and birth of their young.
Mica is said to to be in good health and the new joey has begun taking its first wobbly steps outside the pouch.
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