Note: The trouble with chickens is that they hide their illnesses to such an extent that by the time you notice they are ill, they are inevitably dying. There are two reasons for this. The first is that chickens are prey and therefore instinctually try not to show weakness because they will be the first to be picked off by any predator (even though they are safe in Jurassic Park). And secondly, they don’t want the rest of the flock to be aware that they are sick because for the same reason, sick chickens attract predators and potentially that puts the whole flock at risk – hence the flock will often attack the sick chicken and see it off.