Help with Menu Options

Hey everyone,

So I started a petcare website at http://www.critterhub.com

I’m having some issues with the main menu. I don’t know how to set it up so it is the most user friendly and the most understandable.

Basically, my site is divided into five main categories of information: Amphibians, Reptiles, Freshwater, Saltwater, and Small Animals.

I have caresheets written for each species (there are about 400 caresheets) and I started writing articles for each main category.

What would be the best and most efficient way to set up the main menu? I was thinking maybe have the five main categories on there, then have it dropdown into Articles and Caresheets for each of them. Then have each caresheets page further divide into more specific options like Frogs, etc. and so forth.

I hope this isn’t too confusing (the whole point of this post is to make my website NOT confusing, hahaha).

Any help on making this website user friendly is greatly appreciated.

Thank you,
Neodoxa