The best way to learn about animal anatomy is via interactive apps that show that anatomy in 3d. On the right is an example of such an app that shows the internal anatomy of the edible snail, Helix pomatia.
For relatively simple anatomy as this, you can easily put the whole animal in one app. If you want to go more in-depth, you can single out a single structure and put that in an app too.
For an example click on the button belowNeck Vertebrae App
And click this button for a full screen version of the snail appSnail App