Your sentence is mostly correct, but I can show a few clearer ways to say it and explain why.
Original: An echidna's nose can feel tiny wiggles, so it knows where the bugs are.
Corrected versions:
- An echidna's nose can feel tiny wiggles, so it knows where the bugs are. (This is fine as written.)
- An echidna's nose can sense tiny movements, so it knows where the bugs are. (Uses "sense" and "movements" which are a little clearer.)
- An echidna can feel tiny wiggles with its nose, so it can find the bugs. (Another clear way to say the same idea.)
Short grammar tips:
- Subject: "An echidna's nose" — that is what the sentence is about.
- Verb: "can feel" or "can sense" — both are correct verbs here.
- Comma + so: A comma before "so" is okay when the second part is a full idea (an independent clause). In your sentence, the comma is fine.
Fun fact: Echidnas use their long snout to sense tiny movements and even electrical signals from insects. They then use a sticky tongue to catch the bugs.
Let me know if you want a version that sounds more scientific or more playful!