Don't forget you'll also need a heating set up and that will use electricity that your parents have to pay for. Remember that hedgehogs need 8 square feet of living space. You also need to consider what's going to happen when you need to take your hedgehog to the vet? It's easy to say now that they will take it and pay but usually what happens is the parents don't want to spend money on a vet and the hedgehog is the one that suffers.
You also have to be 100% honest with them, yes hedgehog smell, all animals smell. Yes they get sick and it's more when they will need to see a vet not if. Yes they are noisy at night. Yes you have to figure out what to do when you are out of town. If you're in high school you also have to think what will happen after you graduate.
Right now your parents are responsible for everyone and every living thing in their home. If they don't want the responsibility of a hedgehog then it's not fair for you to try and talk them into it. If you want to be a truly responsible hedgehog owner you will wait until you are able to provide a home where you are responsible for all expenses and not your parents.
You also have to be 100% honest with them, yes hedgehog smell, all animals smell. Yes they get sick and it's more when they will need to see a vet not if. Yes they are noisy at night. Yes you have to figure out what to do when you are out of town. If you're in high school you also have to think what will happen after you graduate.
Right now your parents are responsible for everyone and every living thing in their home. If they don't want the responsibility of a hedgehog then it's not fair for you to try and talk them into it. If you want to be a truly responsible hedgehog owner you will wait until you are able to provide a home where you are responsible for all expenses and not your parents.