महाभारत - उद्योग - अन्योन्यता

निर्वनो वध्यते व्याघ्रो निर्व्याघ्रो छिद्यते वनम् |
तस्माद्व्याघ्रो वनं रक्षेत् वनं व्याघ्रं च पालयेत् ||

- महाभारत, उद्योग

Without the forest, the tiger can not survive. Without the tiger in the forest, the forest will get destroyed (by the people). Hence the tiger must protect the forest and forest must protect the tiger (and other animals)

- Mahabharatha, Udyoga