Hi there,
Congratulations on finishing sixth form! I understand that you're disappointed about not getting the grades you wanted, but it sounds like you're taking a proactive approach to figuring out your next steps.
I think it's great that you're considering online courses as an option. They can be a great way to learn new skills and gain experience, especially in fields like zoology and zookeeping. The placement work that you mentioned is also a really valuable opportunity, and it would give you a chance to work with animals and see if a career in this field is right for you.
As for your parents' wishes for you to go to university, I understand their perspective. A university degree can open up a lot of doors, and it can be a great way to further your education and advance your career. However, I don't think you should rule out the online courses just because they're not a traditional university degree. They can be just as valuable, and they may be a better fit for you right now.
Ultimately, the best path for you is the one that you feel most comfortable with. If you're passionate about zookeeping and you think that the online course would give you the skills and experience you need, then I say go for it! You can always go to university later if you decide that's what you want to do.