Possible Clues:

• Toothless Aussie mammal
• Aquatic creature, a sort endlessly consumed in addition
• Primitive mammal, duck-billed
• Egg-producer distributes supply at random
• Scaly cat losing its tail to animal in Australia
• Egg producer's supply at capacity
• Mountain-climbing sort finally missed American mammal
• French plate has you mixed up with spy as down under Bill follows duck
• Australian animal
• Time invested in sport - short, vigorous effort for Australian resident