First website. Thought's and critique welcomed.

I have put together a website to try and turn my hobby into my main source of income.

The site says it all so I will say no more aside from I am looking for all kinds of feedback.

http://seewildlife.com

You appear to have a webSITE consisting of one webPAGE ...??
Navigation appears to be scrolling or fast scrolling through the various categories to "jump" to the relevant position on that page?

Can't say I am a big fan of that particular style.
Visually it is distracting as the screen rolls up and down
Doesn't allow you to build a more complex site as your site evolves.

Each of your categories should be a separate webpage (IMO)
I would image your "galleries" will eventually take up a significant amount of your site.
---- Categories???
No contact information? Unless you count your social media icons - which a visitor would only see scrolling past if you happen to click on the "Wildlife Walks" link. IMO you need a specific web form/page for visitors to complete (eg Wufoo form)

Fundamentally I can not see any sense or future in creating a website in this form - this is not how people expect to use a website. I would suggest you visit as many business wildlife websites you can so that you can see the essential features you need and like ... that will work.
As it is, your web design is completely flawed in my opinion (but I have been know to be wrong far too many times to count!)

As an aside - have you done enough research that confirms you will be able to turn "Wildlife Photography" hobby into your "main source of income". Wanting something is not the same as achieving something. It looks like a VERY tough road to travel. Who is going to BUY wildlife photos in sufficient quantities to make this venture your main source of income?
Not trying to burst your bubble, but are you looking at this from a businessman's point of view or from a photographer's point of view?

Thanks for your input. Some good points for me to pick over.

I would just like to point out that I am not selling any photos here or have any intention of doing so.

oops - my bad on that ... sorry.