Types Of Mechanical Weathering 

In this picture the squirrels are hitting the nuts on the rock. That is also abrasion.

Abrasion. Waves hitting rocks.

This picture shows exfoliation. exfoliation is when sheets of rock peel away from a large body of rock because pressure is removed.

This tunnel is the result of Animal Action. This happens when a rabbit burrows its whole. The rabbit loosens up the dirt and forms the hole.