The echidna curls up into a ball of spines when threatened. Dream tradition reads it as self-protection, a gentle nature behind a prickly surface, and the need for time alone.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.