
09/02/2025
My Take Tuesday: The Plasticity of Parturition
There are places in this world where the horizon rolls on forever, where the wind speaks in whispers and shouts, and where survival is written not in words, but in the hoofprints of millions.
The Mongolian gazelle (Procapra gutturosa) is one such story written across the vast pages of the Eastern Steppe. With a heart-shaped patch of white on its rump and legs built for the long haul, this medium-sized antelope travels as part of one of the last great migratory herds on Earth. Over 1.5 million strong, these gazelle roam across the largest intact grassland in the world, following forage like a compass follows north.
Herds of 100,000 are a common sight here—rivers of muscle and instinct moving across a sea of grass. But it’s during calving season, brief and explosive, that something near miraculous unfolds. Within just two weeks, as many as 400,000 females converge. And in a span of four days, the vast majority will give birth.
This is not coincidence. It’s a calculated gamble written deep into the species’ biology. By synchronizing birth, they overwhelm the predators. A jackal or wolf can only take so many. The sheer abundance of newborns creates a survival buffer. But that’s not the only purpose. The timing also gives the young enough weeks under summer sun to grow strong before the cruel winter arrives.
Some scientists believe this synchronization isn’t just about tooth and claw—it’s also tied to the land itself. To the grass. To the moment when the forage is richest when plants hit their peak in nutrition. It’s nature’s version of perfect timing, aligning birth with the buffet.
And the gazelle aren’t alone. Reindeer, caribou, alpacas, wildebeest—even banded mongooses—show similar patterns. The induction of parturition, the triggering of birth, varies from species to species, but the cast of characters remains familiar: progesterone, estrogen, prostaglandins, oxytocin. Hormones whispering when it’s time.
These adaptations serve both mother and child. Evolution, it seems, has no interest in waste. It sharpens both ends of the blade.
We’re only beginning to understand the depths of these reproductive rhythms. Over thousands of years, such traits have meant the difference between life and extinction. Now, as we seek to conserve endangered species and improve agricultural production, this knowledge becomes more than curiosity—it becomes a toolkit.
If we can better grasp the interplay of reproduction with behavior, nutrition, stress, and genetics, there’s no telling what doors it might open. Perhaps even for our own species.
And that is my take.
N. Isaac Bott, DVM