The river was leaving.
Not all at once. A river leaves slowly, edge first, the way a puddle dries after rain. Every morning the water had stepped back a little more, and the great flooded grassland of South America was turning from silver to gold to dust.
The capybaras noticed, and grumbled.
The wading birds noticed, and flew off to find better puddles.
And in the last deep pool, someone enormous noticed too, though almost no one ever saw her. Her eyes and her nostrils sat right on top of her head, so she could rest beneath the surface with only two small bumps showing, quiet as a pair of floating seeds.
She was a green anaconda. The heaviest snake in the whole world, and heavier than a grown man.
In the wet months, water had covered everything, and she had gone everywhere, swimming with a grace her size kept secret. Water carried her. Water hid her. Water was her whole kingdom.
Now the kingdom was shrinking, one sunrise at a time.
Where does a river go when it leaves? And does it remember the way back? The caimans crowding into the pool did not know. The catfish did not know.
The anaconda did not ask. She did what her kind has always done when the world runs low.
She waited.
When the pool shrank to a pond, she waited. When the pond shrank to a wallow of warm mud, she eased her great body down into it, deep and cool, and grew still. Anacondas can do this. They slow themselves down, tuck into the mud, and let the dry season pass over them like one long afternoon.
Stillness is easy for an hour.
She was still for weeks.
Above her, the sky stayed blue and stingy. The grass crisped. The dust danced in the hot wind. And the mud held her like a secret the ground was keeping.
Then, one night, a sound.
Far off. Low. A drumroll, rolling closer.
Thunder.
The first rain fell fat and warm. The ground drank. The wallow became a pond, the pond became a pool, and the pool reached out and took the grassland's hand. The river, just as she had trusted, remembered the way back.
She rose through the brown water, and the two small bumps of her eyes broke the surface into a world made of silver again.
And when the wet season stood tall around her, she gave the flooded grass its finest gift. Her babies came, dozens of them, each about sixty centimeters long, born alive straight into the water and swimming from their very first minute.
By morning the warm shallows were freckled with tiny pairs of bumps. Little eyes. Little nostrils. Dozens of small swimmers already learning the family trick of being magnificently invisible.
Rivers leave, and rains return.
And patience, held long enough, becomes a river of its own.