It is one thing to eat chicken every day. It's something else to have that on your permanent record, as in the geological record, the remnants of our time that archaeologists or aliens will sift through to determine who we were and how we shaped our world.
But a group of scientists argue in an essay published in the journal Royal Society Open Science that this is exactly how our time on Earth will be marked, by leftover chicken bones. We live in the Age of the Chicken.
There are about 23 billion chickens on Earth at any given time, at least 10 times more than any other bird, 40 times the number of sparrows. The second most numerous bird on the planet, at an estimated population of 1.5 billion, is a small creature called the red-billed quelea, sometimes known in its home of sub-Saharan Africa as a feathered locust.
The combined mass of those 23 billion chickens is greater than that of all the other birds on Earth. But, said Carys Bennett, an honorary fellow at the University of Leicester and one of the authors of the essay, it is not only the mind-boggling numbers of chickens that will tell a tale of our times, but their shape, genes and chemistry.
"We have changed the actual biology of the chicken," she said.
Chickens seem to have been domesticated about 8,000 years ago, and gradually bred to be larger and meatier than their jungle fowl ancestors. But it was not until production of broilers ramped up in the 1950s and farming practices changed that the bird was transformed.
The modern broiler chicken, with an average life until slaughter of a scant five to nine weeks, has five times the mass of its ancestor. It has a genetic mutation that makes it eat insatiably so that it gains weight rapidly. It is subject to numerous bone ailments because it has been bred to grow so quickly.
The broiler is also completely dependent on and designed for an industrial system of meat production. It can only live supported by human technology. The chickens are transported to slaughterhouses at no older than nine weeks (broilers at some farm animal sanctuaries live four years or more) "where most waste products (feathers, manure, blood, etc.) are recycled via anaerobic digestion, incineration and rendering into edible byproducts, all technology dependent."
