The largest and heaviest four-footed creature now existent on Dunk Island is the so-called porcupine (spiny ant-eater or echidna). An animal which possesses some of the features of the hedgehog of old England, and resembles in others that distinctly Australian paradox, the platypus, which has a mouth which it cannot open--a mere tube through which the tongue is thrust, which in the production of its young combines the hatching of an egg as of a bird, with the suckling of a mammal, and which also has some of the characteristics of a reptile, cannot fail to be an interesting object to every student of the marvels of Nature. When disturbed, the echidna resolves itself into a ball, tucking its long snout between its forelegs, and packing its barely perceptible tail close between the hind ones, presenting an array of menacing prickles whencesoever attacked. While in this ball-like posture, the animal, as chance affords, digs with its short strong legs and steel-like claws, tearing asunder roots, and casting aside stones, and the ease and rapidity with which it disappears in soft soil are astonishing. The horrific array of prickles presented as it digs an undignified retreat, and the tenacity with which it holds the ground, have given rise to the fiction that no dog is capable of killing an echidna. No ordinary dog is. He must be cunning, daring, brave, insensible to pain, and resourceful. Then the feat is quite ordinary. Indeed, once the trick is learned, the trouble is to keep the dog from attacking its innocent, useful and most retiring enemy. The echidna has the ill-luck to possess certain subtle qualities, which excite terrific enthusiasm for its destruction on the part of the dog. Either there is an hereditary feud between the dog and the echidna, which the former is bound in honour to push to the last extremity, or else the dog regards the prickly creature as a perpetual affront, or specially created to provide opportunities for displaying fanatic hatred and hostility. No dog of healthy instinct is able to pass an echidna without some sort of an attempt upon its life. The long tubular nose of the echidna is the vital spot. This is guarded with such shrewdness and determination as to be impregnable. But the dog which pursues the proper tactics, and is wily and patient, sooner or later-regardless of the alleged poisonous spur--seizes one of the hind legs, and the conflict quickly comes to an end. By the blacks the echidna, which is known as "Coombee-yan," is placed on the very top of the list of those dainties which the crafty old men reserve for themselves under awe-inspiring penalties.