What is an echidna?
my science work
They are also known as spiny anteaters, and look a lot like porcupines. They belong to the (I don't know how to say it) Tachyglossidae family, and are one of the few mammals that lay eggs.
An echidna is a small but solitary mammal which is characterized by coarse hair and spines. They belong to the family of tachyglossidae. Check out http://en.wikipedia.org/wiki/Echidna for details.