Just for the record a zoologist doesn't work in a zoo
It really made me laugh seeing how many people thought that's what zoologist do. Zoologists study animals in their natural environments, many conservationists start their lives on a zoology degree.
When you work in a zoo you become a zoo keeper and to become a zoo keeper you don't need a degree.
Also there are many many biology degrees you can do... I personally pick my degree based on what I enjoyed vs what I am likely to get a job in vs how much money I want to make.
I would steer clear of, straight Biology and marine biology. Most biologists struggle because all the people who've specialised snap up their jobs as they're often 'in a way' more qualified. Marine biology in short is...fun. Fun degrees attract people... lots of people. Lots of people going for the same jobs = most people not getting a job.
Zoology (if you like ecology and conservation) is a nice route to go down. You may well get to travel if you get a job in that sector and you may get to work with animals but the chances are it wont be hands on.
If you want hands on and getting dirty but lots of fun it's basically low $, if you stick more to the science side and are a bit more hands off the cuddly side then you tend to get more $$.
There are exceptions to everything.
Just make sure you're doing something you enjoy and you're doing it with the right motivation otherwise you'll get bored.