My chickens once ate a whole styrofoarm ice chest. It didn't affect them in any way.
It may not have affected them in any way that you can see, however, the EPA has determined that styrene is carcinogenic in humans.
Your chickens may not exhibit any symptoms since the chemicals are insidious in onset.
Expat Brit living the dream - 40ish chickens, 2 Beagles, 2 cats, rabbits........and counting.
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