2008 $1 Land Series Echidna Coloured Uncirculated CoinEchidnas are small spiny monotremes with a long snout. Echidnas have powerful limbs with long claws for digging. The are widespread throughout Australia, from alpine areas to the outback deserts. Echidnas are the only mammals aside from the platypus that lay eggs. Baby echidnas are called puggles. They hatch from the egg after ten days then live inside the mother's pouch for about 50 days, feeding on her milk.