Kai the Echidna born last year at Perth Zoo is growing well. Now Kai weighs nearly 1.2 kg and, as you can see, the spines are really starting to come through. Kai is the sixth echidna born at Perth Zoo since 2007. A mother Echidna incubates a single egg for about 11 days before it hatches. The puggle weighs less than one gram when it hatches. The puggle is then carried around in its mother’s pouch for two months before being deposited in a nursery burrow.