It takes about 22 days after mating for the female to lay a single egg in her pouch, which has a soft shell, weighs roughly 2 grams and is about 1.4 centimetres big. 2. Like all mammals, echidnas feed ...

Aside from the duck-billed platypus, the echidna is the only mammal that lays eggs. Of the four echidna species three have long beaks, with the Attenborough echidna, and the western echidna ...