You can proficiency in the Perception skill. 

Your Constitution score increases by 1, your Intelligence score increases by 2, and your Dexterity score is decreased by 1.

Your walking speed is 25 feet and you have a burrowing speed of 25 feet.

The backs of echidnians are covered with spiny quills, which makes it impossible for them to wear armor. These quills provide exceptional protection, however, and you are treated as having a base armor class of 14. While you can’t wear armor, you can still benefit from the armor class bonus provided by shields so long as you are proficient with them.

​ You can use your action to curl up, exposing attackers to a wall of your toughened quills. While curled up in this way you cannot move, attack, or cast spells with somatic components, and your base armor class becomes 17. You cannot benefit from any Dexterity bonus to armor class while curled up, but you can still use shields.  Any creature that misses you with a melee attack while you are curled up takes 1d4 points of piercing damage from your sharp quills. If a creature hits you while you are curled up, however, you are knocked prone in your space at the end of the turn. You may uncurl yourself as a bonus action during your turn. 

You can speak Common and Primordial