Good job — your sentence is mostly correct! Here is a clearer version that a reader will understand right away:
Corrected: An echidna's nose can feel the tiniest wiggles of bugs in the dirt.
Why this is better (step by step):
- Subject: "An echidna's nose" tells us what we are talking about.
- Verb: Adding "can" (can feel) shows the echidna's ability to feel those wiggles.
- Object: "the tiniest wiggles of bugs in the dirt" tells us exactly what the nose feels.
Other simple ways to say it:
- "An echidna's nose feels tiny wiggles from bugs in the dirt."
- "Echidnas can feel the tiniest wiggles of bugs in the dirt with their noses."
All versions are correct; the one with "can" is a little clearer about ability.