Now hear of Marsupios—the second-born
Of Mammos' ancient house, who chose
A different covenant than the first-born
Monotremos, and a different way from those
Who would come last: for Marsupios invented
The pouch.
Not the womb—that was Placentos'
Later innovation—Marsupios contented
Herself with this: a birth of intense
And premature delivery—the newborn
Barely formed, a jellybean of pink
And naked flesh, blind, deaf, a firstborn
That crawled by instinct from the brink
Of the birth canal to the mother's pouch
And found the nipple there, and latched, and grew
Outside the body in the mother's crouch
Of warmth—the pouch became the view
Of the world for months: a living nursery
Where the infant developed in the open air
But sheltered, fed, protected—the cursory
And rapid birth exchanged for the extended care
Of the pouch's warm interior.
And this
Was Marsupios' great advantage in the south:
When drought or fire destroyed the bliss
Of a good year, the mother's mouth
Could simply release the joey—harsh
But efficient—and begin again
When conditions improved, the marsupial's marsh
Of reproductive flexibility, the plain
And unsentimental logic of a world
Where resources fail without warning.
In Australia—that drifting, curled
And isolate continent, the morning
Of the Cenozoic found Marsupios
Alone with Monotremos, and no placental
Competition—and the marsupial's dose
Of adaptive radiation was monumental:
Into every niche the mammals could imagine,
The marsupials radiated on that island continent—
Macropos invented hopping: the badgin
Of energy-storage in the tendon's bent
And elastic spring that made the kangaroo
The most efficient long-distance runner
On the planet—for the hop's breakthrough
Was this: the tendons stored the stun of
Each landing as elastic energy
And returned it in the next leap—no
Metabolic cost above the lethargy
Of standing still, once the kangaroo's slow
Acceleration reached its cruising speed.
Thylacos—the thylacine—was the marsupial's
Answer to the wolf: a dog indeed
In everything but ancestry, the visual
Convergence almost perfect—striped back,
Long jaws, the pack-hunter's lean
And ranging body—on the track
Of prey through the Tasmanian green
And the wider Australian bush, the thylacine
Proved that evolution's patterns repeat:
The same problem—how to hunt, how to convene
The pack, how to bring down fleet
And larger prey—produced the same solution
In the marsupial as in the placental:
The wolf-shape, the social restitution
Of cooperative hunting, the elemental
Logic of the predator.
And Diprotodontos—
The giant wombat, two tons of herbivore,
The largest marsupial whose confronting
Of the Pleistocene grasslands was the core
Of the Australian megafauna's pride—
He browsed the scrubland like a furry tank,
With no predator large enough to override
His bulk—and from his lineage's rank
The modern wombat still digs the deepest
Burrows of any mammal on the earth.
In South America the marsupials kept
A different vigil—for when the birth
Of the land bridge at Panama connected
North and South America at last,
The placental mammals were directed
Southward, and the great interchange passed
A judgment on the marsupials of the south:
Most could not compete, and faded
Under the placental's overwhelming mouth
Of competition—but the opossum raided
Northward in return, the only marsupial
To conquer the placental's territory—
Didelphis, the opossum, the unusual
And ancient generalist whose inventory
Of survival skills included playing dead,
Eating anything, breeding fast,
And never specializing—the widespread
And humble opossum would outlast
Every specialized competitor by being
Nothing in particular but alive.
Honor Marsupios—the seeing
And the pouched, who proved that to survive
Is not always to compete but to find
The island where your way of being
Is the only way—and there, the mind
Of evolution, patient and far-seeing,
Will build from your body every form
The world requires: wolf and lion,
Mole and mouse, through every storm
Of geological time—on your own Zion.