Simplify the following text for a Grade 6 native English-speaking person.
Original: The nostrils and the mouth are at the distal end of the snout ; the mouth of the Short-beaked Echidna can not open wider than 5 m. The body of the Short-beaked Echidna is , with the exception of the underside , face and legs , covered with cream-coloured spines .
Simplified: The mouth of the Short-beaked Echidna can not open wider than 5 mm . The body of the Short-beaked Echidna is , except for the underside , face and legs , covered with cream-coloured spines .