Orn moved on, observing everything but questioning nothing. Timorous hairy mams scooted from his
path, afraid of him; these represented innocuous lines. He traveled a shallow valley that led gradually
downward toward a body of water. Soft, flat vegetation of the new type crowded the edge of the
water and floated on the surface, an increasing amount of it bearing flowers. Small fish, piscs, flashed
where a streamlet flowed over naked stone and coursed between round mossy rocks; they were an
ancient and multiple line, and now and then one came to kiss the surface of the lake.
Once more Orn remembered: the flowing water was a different medium from the passive depths of
the sea, as different in its fashion as air from land. The flaccid flesh of the calm ocean depths had had
to develop a stiffened but flexible rod of gristle along its length, lest it be tumbled into danger by the
new phenomenon of current. To this gristle the expanding muscle tissue was anchored; progress was
no longer random but forward, against the flow. Before his line diverged from that of the piscs, they
had invaded the less-habited regions up the current, and changed in the process. The spinal rod
protected increasingly important nerves, for coordination had become essential; then the gristle
hardened into cartilage and then into bone. The skeleton was the gift of flowing fresh water, and so
the land had already affected life in the sea.
But the rivers of the past were fast and shallow, and they flowed from the bleak inhospitable mass of
substance that formed the continent, and from time to time the ambitious swimmer was stranded in
some stagnant pool. He had to gulp life from the surface, even as these fish in the lake did now, and
hold the bubble in his mouth in an effort to absorb from it the breath that had left the water. But his
mouth was now encumbered with jaws and teeth and tongue, all needed for feeding. Thus he was
forced to develop a special cavity in the throat, a bag, a chamber—a lung. When the water of his
isolated pool finally sank to nothing, his fins had to strengthen into four stout limbs to support the
body against the gut-wrenching land gravity, and the new lungs sustained life entirely. It was a brief
but awful trek, that first journey over the cruel land, and almost every fish who tried it perished; but
that fraction who were not only determined and strong but fortunate as well—Orn's own line—won
reprieve in a deeper, fresher pool.
Orn remembered the original home: the water. He remembered the gradually lengthening adventures
over a land inhabited only by pulpy vegetation and rapidly scrambling arths, until most of his life was
spent upon it and he was no longer a true fish. He remembered the hardening of the rind around the
soft eggs, until they withstood to some extent the ravages of sun and air. A small step, but significant,
for it meant that the sea had let slip its last lingering hold. A complete life cycle could occur without
the intervention of the ocean.
By the shore of the lake he found the body of the male bird. This one, too, had perished
violently—but unlike his mate, he had taken his enemy with him. A long, powerful rep lay belly-up
on the sand, its tail in water, its eyes two bloody sockets, its gut an open cavity. Gore on the beak and
talons of the bird betrayed the savagery of its attack, here at the fringe of the rep's demesne; but the
scattered feathers and blood on its breast showed that the teeth of the croc had not fastened on empty
air.
Had the rep reached water before the bird attacked, the rep would have won the battle easily. But it
had not, perhaps because of wounds inflicted by the female bird. Now all three combatants were food
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