“While free-range egg farmers would prefer their birds to be outside, they also wouldn’t want to risk the health of their birds. Their sheds have plenty of room for the birds to move around freely and include scratching areas so birds can still display their natural instinctive behaviour.
Farmers have also put in additional stimulants like footballs, cabbages and even Christmas trees to keep the birds happy.” https://www.theguardian.com/world/2017/feb/28/eggs-temporarily-lose-free-range-status-due-to-bird-flu-restrictions
In ancient times, jungle fowl were originally domesticated for their invaluable natural instinct to peck up fallen pine needles.
After perfunctory testing on chickens, cabbage is set to be marketed as a natural alternative to recreational stimulants.
“The eggs of many animals – from trout in the Gulf [of Mexico] to pelicans nesting as far away as Minnesota – have been found to contain oil and the dispersant used by BP in the wake of the [Deepwater Horizon] spill.” (http://www.theguardian.com/environment/2015/mar/31/bp-pr-effort-gulf-coast-deepwater)
Any desirable ‘self-cooking-and-washing-up-after’ properties promoted by BP were met with scepticism by Easter eaters.
“Red and green magnetic fluorescent powders were the most successful at recovering fingerprints from feathers. Black magnetic powder was the most successful at recovering fingermarks from eggs.” (http://www.theguardian.com/environment/2015/jan/14/scientists-recover-fingerprints-bird-feathers-eggs)
Not all you clutch is fair game so beware of being fingered for foul-play.