Best plural sentence: Tahrs look like goats with puffy manes and curved horns.
Also correct (singular): A tahr looks like a goat with a puffy mane and curved horns.
Why these are correct (easy steps):
- "Tahrs" means more than one tahr. For more than one, we use look, not looks.
- When we talk about many tahrs, we say puffy manes (many manes). If we talk about one tahr, we say a puffy mane.
- We say curved horns because tahrs have two horns, so that is plural.
Great job — your sentence was almost perfect! These tiny changes make it match whether you mean one tahr or many tahrs.