Now hear of those who solved the oldest dream
Of every land-bound creature looking up:
Pteros, who rode the thermal's rising steam
And drank the sky like water from a cup.
Not bird—for birds were dinosaurs, and these
Were something else: the children of a branch
Near Avemeta's root, who took the breeze
And stretched a single finger to a blanch-
White membrane, thin and strong, that caught the air
And held it—the fourth finger of the hand
Extended past all reason, and the rare
And living skin stretched from that finger-strand
To the body and the leg—a wing
Built not from feathers but from a kite
Of skin, a bat-wing's cousin, the ancient string
Of membrane that gave Pteros his first flight.
He was the first vertebrate in the sky—
Not counting the gliders of the Permian trees,
The small and desperate lizard-forms that fly
For a moment between branches in the breeze—
Pteros achieved true powered flight: the beat
Of membrane wings against the Triassic air,
The lift and thrust and banking that complete
The mastery of the third dimension's lair.
His bones were hollow—lighter than a thought,
Thin-walled as paper, filled with air-sacs that
Extended from his lungs and brought
The oxygen of altitude to bat
Through every wingbeat's metabolic need.
His brain was large for his body—the cerebellum
Swollen for the balance and the speed
Of aerial computation—every stellum
And coordinate of the three-dimensional world
Mapped in neural tissue that the landlocked
Reptile never needed—but unfurled
In the sky, where any error mocked
With gravity's implacable demand.
The first Pteros were small—sparrow-sized,
With teeth for catching insects on the strand
Of evening air, with wings not yet king-sized
But adequate for the modest Triassic skies
Where no other vertebrate competed
For the aerial niche—Neopter's flies
And dragonflies had owned it, undefeated,
For three hundred million years—but now
A backbone and a warm-ish body brought
A new competitor beneath the brow
Of every Triassic sunset, and the thought
Of vertebrate dominion in the air
Began with Pteros' small and toothed patrol
Of the evening sky, catching his share
Of insects in the aerial aureole.
His children would grow large—enormous—some
With wingspans wider than a fighter plane—
Quetzal of the Cretaceous would become
The largest thing that ever flew—but that refrain
Is for a later chapter. Here, the start:
Small, toothed, membrane-winged, and insect-fed,
Pteros took the sky and played his part
In the Triassic's grand experiment, and led
The first invasion of the vertebrate
Into the realm that only arthropods had known—
And in the evening light, however late,
His silhouette against the sky was sown
As promise of the wings to come.
Two solutions
The vertebrates would find to powered flight:
Pteros' membrane and the feathered contributions
Of Deinos' later children—but tonight,
In the Triassic's fading light, only one
Existed: the membrane wing, the finger-kite,
The pterosaur ascending toward the sun
And banking in the thermal's lifting height.
Honor the first fliers—Pteros and his kin
Who dared the three-dimensional world above
The ground where every other creature's been,
And found in the empty sky a kind of love
That only those who fly can understand:
The freedom of the air, the lift, the soar,
The world below becoming merely land—
And the sky, the sky, becoming something more.