Shooting through something is an advanced technique in composition.
Use this approach to create more dimension in your images and make them look more 3D.
Also adding some foreground elements creates a feeling of your presence. Like you are spying or secretly looking at your photographed subject (a squirrel in this case).
In addition you can create softer images or softer edges in any image by shooting through something. This will make your pictures more light and dreamy
Read more about other Composition techniques here>>