Whats a pet my parents would let me have?

Im 13 years old and i LOVE ! animals! i want to be a vet when im older! and i allready have 2 cats,a dog, 3 fish and 2 hermit crabs.... i take very good care of all my pets and i love them to death i would do anything for them ! My parents dont want me to get anymore pets but i really want another one ! my guinnie pig just died after about 6 years so it wouldnt be a rodent or anything like that, no more cats or dogs, iv had birds.. iv had 2 lizards but i may consider another one..or maybe a turtle? is there any low maintence pet that would be good for me? I dont think theres any reptile i could put in my hermit crabs tank.. if there is tho please tell me ! soo, any ideas i could throw around and suggest to my parents?