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with + instrument/material/ingredient

The dam was built with steel and concrete.

by + agent

The organisation was started by the government.

Note: We omit by when who/what did the action is not known or not important.

1 The wallabies were brought to Scotland by Lady Colquhoun.

2 The hikers were equipped with raincoats and walking boots.

3 Over the years, the forest has been destroyed by people cutting down trees.

4 The Kazakh steppe is covered with grass.

5 The red panda is hunted by people for its fur.

1) by;

2) with;

3) by;

4) with;

5) by.