While the great ones ruled the Triassic plains—
While Cruros held the rivers and the lowlands
And Deinos' children ran in upland lanes—
The children of Cynos lived in small commands
Of burrow-dwelling, nighttime, careful kinds
Who had inherited the Permian loss
And carried in their milk-producing glands
And fur-touched skin the memory of the cross
That Synaps' dynasty had borne: the fall
From Permian dominance to Triassic shadow,
From the world's great lords to creatures small
Enough to hide in any grassy meadow.
For Cynos had been great—remember this—
His father Theraps and his grandsire Pelyon
Had ruled the Permian world in tooth and kiss
Of predator and grazer—every hellion
And gentle herbivore of the synapsid age
Had answered to the house of Synaps once—
But the Great Dying wrote a different page,
And those who survived were not the mighty hunts-
Men of the Permian peak but the burrowers,
The small ones, the ones who ate the least
And needed least, the underground endurers
Who outlived the fire and the poisoned feast.
And now, in the Triassic's middle years,
The children of Cynos grew smaller still—
For the archosaurs above pressed down with fears
And appetite on anything that filled
A niche above the size of a shrew.
The night
Became the cynodont's domain—the dark
Where the cold-blooded archosaurs lost their might
And the warm-blooded mammal-kin could mark
Their territory by scent and sound and the feel
Of whiskers in the dark—those whiskers that
Cynos had first grown, the sensory wheel
Of vibrissae that turned the blind and flat
World of the nighttime into a map of touch.
And in the late Triassic, from the smallest
Of Cynos' shrinking children, came the clutch
Of the first true mammals—Mammos, the humblest
Of all the heirs of Synaps' ancient line,
Who bore the full inheritance at last:
The three ear-bones that heard the world's design
In frequencies the reptiles could not cast
Their hearing toward—the jaw-bones of their fathers
Had migrated to the middle ear and become
The hammer, anvil, stirrup—from the gathers
Of a hundred million years, the sum
Of Synaps' extra jaw-bone's slow migration
Toward a new and finer purpose—hearing,
Acute and intimate—the transformation
Of what had been a biting tool, the steering
Of evolution taking surplus bone
And turning it to something new: a sense
So delicate it heard the forest's tone
In registers of exquisite consequence.
And milk—Mammos gave his young the gift
Of milk, the mother's body feeding from
Within itself, the evolutionary shift
That freed the newborn from the egg's aplomb
And bound it to the mother's warmth instead—
A cord of nourishment more flexible
Than any yolk-sac: wherever mother fed,
The infant fed, the bond invincible
And portable across whatever land
Or climate or disaster came.
And fur—
The full and covering warmth, the body's band
Of insulation that allowed the stir
Of metabolism through the coldest night,
That kept the body's engine running when
The archosaurs went slow—the mammal's right
To the nighttime world, the moonlit den
Where small eyes gleamed and small teeth cracked the shell
Of beetle, and small whiskers read the dark,
And small bodies kept themselves alive and well
On what the daylight giants left—the bark
And seed and insect of the shadow-world.
This was the vigil—one hundred million years
Of smallness, of the patient flag unfurled
In darkness, of the nighttime pioneers
Who kept the synapsid flame alive
Through all the Mesozoic's long dominion
Of the archosaur lords—content to survive
And wait, and hold, and keep their one opinion:
That the night was theirs, and the future
Was written in the milk and fur and bone
Of the smallest creatures—the suture
Between the past and the world yet unknown
Was the mammal in the burrow, warm and small,
Who heard the world in frequencies the giants
Could never know, and who would outlast them all.
Honor the vigil. Honor the quiet clients
Of the nighttime world who kept the ancient fire
Of Synaps' dynasty burning through the dark—
And waited—for the night rewards desire,
And the patient inherits every empty park.