Here are four ways to say the sentence differently but with the same meaning:
- When an echidna burrows into the dirt, the only thing a hungry animal can try to attack is its sharp spines.
- After an echidna digs into the ground, a predator can only get hurt by its spiky spines if it tries to attack.
- An echidna’s spines protect it when it hides in the soil from animals that want to eat it.
- Once an echidna has buried itself in the earth, any hungry predator will have to face its sharp spines to attack.