THE CROW AND THE SWAN
A Crow was filled with envy on seeing the beautiful white plumage of a Swan, and thought it was due to the water in which the Swan constantly bathed and swam. So he left the neighbourhood of the altars, where he got his living by picking up bits of the meat offered in sacrifice, and went and lived among the pools and streams. But though he bathed and washed his feathers many times a day, he didn't make them any whiter, and at last died of hunger into the bargain.
You may change your habits, but not your nature.
THE STAG WITH ONE EYE
A Stag, blind of one eye, was grazing close to the sea-shore and kept his sound eye turned towards the land, so as to be able to perceive the approach of the hounds, while the blind eye he turned towards the sea, never suspecting that any danger would threaten him from that quarter. As it fell out, however, some sailors, coasting along the shore, spied him and shot an arrow at him, by which he was mortally wounded. As he lay dying, he said to himself, "Wretch that I am! I bethought me of the dangers of the land, whence none assailed me: but I feared no peril from the sea, yet thence has come my ruin."