Yes — the sentence is correct!
Here is a simple step-by-step explanation:
- Subject: "An echidna's super nose" — the 's shows the nose belongs to the echidna.
- Verb: "doesn't miss" — short for "does not miss." We use "doesn't" because "nose" is one thing (singular).
- Object: "a single moving bug" — this tells what the nose does not miss. "Moving" describes the bug.
So the sentence means: The echidna's nose always notices every bug that is moving.
Some simple alternatives you can use:
- An echidna's super nose doesn't miss any moving bug.
- An echidna's super nose never misses a moving bug.
All of these are correct and mean the same thing.