Can kangaroos delay or prevent pregnancy when times are hard?

Many of the 60 or more species of kangaroos can "pause" their pregnancy. This is called "embryonic diapause". The mother kangaroo spends most of her adult life pregnant, but in drought times, she has the ability to indefinitely "freeze" the development of the young embryo until food sources are replenished. This is one of the kangaroo's adaptations for living in a harsh country like Australia.