Eggs must be one of the most alluring shapes in nature. Perfectly smooth and almost round, their promise seems unlimited – complete meals, potential life, Easter symbolism and faith in the future wellbeing of our troubled planet. The novelist Philippe Claudel makes one of his characters refer to them as “little worlds”, hinting at the universe of concentric marvels contained inside an egg.
A hen decides for herself when to sit on eggs, her broodiness dictated by her own private timetable. Our own Buttercup took the plunge four weeks ago when she found herself irresistibly attracted to those wonderfully smooth, expectant shapes. We chose five lovely specimens and her own coop for her to incubate them, and she rewarded us by sitting faithfully. She left the nest promptly once a day, always emitting the sharp, metallic clucks peculiar to a broody hen away from her eggs.
Buttercup is a particularly fierce and protective hen when sitting. But as her eggs reached full term she became paranoid of any movement close to her, greeting our visits with angry chirrups and hisses. One day she fluffed herself out even more than usual and held herself carefully above the nest, appearing to tread, yes, on eggshells. The next day two bright and fluffy chicks appeared, one yellow and the other a mottled black.
That was then. Buttercup had been the guardian of five eggs but only two had hatched. A hen has about 24 hours to save the rest of the clutch, after which she must lead her young family out to forage. Knowing that any unhatched eggs would be left to go cold, we had armed ourselves with a borrowed incubator to care for the remaining three. Or so we thought.
This is when Lucky entered our lives. We had given Buttercup five eggs but when we came to candle them for chicks halfway through the sitting, there was a sixth. The interloper had no laying date and was one of a number of very small eggs we had specifically planned to exclude. And yet at candling there it was, apparently laid by another hen while Buttercup’s back was turned, and containing a rather advanced chick. 
It was to this egg that all eyes turned as it lay with its three larger companions in the incubator. My husband heard cheeping and we all crowded round. Then I saw it: the smallest egg was rocking; it rolled back and forth in a barely perceptible dance. Soon it developed an unmistakable crack in the shell.
The family’s excitement reached fever pitch from then on. The egg was watched over in relays and our daughter Nathalie clucked, talked and sang to the chick as it struggled to free itself of the protective home that had become its prison. We did lift away a bit of shell and then the “tooth” appeared, cutting in circles and enlarging the hole. But progress was slow, and it was while three of us we out that Nathalie witnessed the greatest miracle of all. The tiny creature threw off its calcareous shackles and greeted the world.
Well, you never saw anything so ungainly. Chicks hatched by any self-respecting mother hen are produced in public dry, fluffy and pert. Not this one. It was flat on its stomach at our first meeting, eyes closed, breathing hard and covered in sparse, slimy black fluff. We watched through the incubator’s perspex cover as the creature tried to stand, fell on its side, rolled on its back with little legs flailing, failed to turn over and generally made a fool of itself. 
Slowly it gained strength, and with a helping finger here and there it learned which was the right way up. We had to call it Lucky: it should never have been laid, or sat on, or hatched. And yet there it was (or rather he, given the prominent comb); he made us realise how much goes on under the hen that we never see. These blind, wet, helpless newborns are coddled in the shadowy recesses of her belly until they can survive the cold outside.
Lucky really needed a mother. He cheeped in alarm whenever we left him alone, and an incubator, when all’s said and done, is really quite a hard place. We introduced him to Buttercup, and to our delight she welcomed him as her long-lost babe, though he took longer to accept her. She leaned over to draw him close and when we next looked, he had disappeared completely beneath her.
The photo at the top, in which Lucky appears to be smiling, was taken the following day.