Charlou wrote:Xamonas Chegwé wrote: Do the individuals in the herd fear their own demise in the approach of a predator? Do they watch for movements in the undergrowth because they are scared of lions? No. They act as they act because that is what is hard-wired into their brains directly from their genes. Their fear is visceral, their reactions are instinctive
That doesn't make sense ... you're asserting an uncaused cause there. How did their fear evolve and become part of their behaviour? What brought it about? If they had nothing to fear they would not have developed fear.
Evolution developed the fear. Animals that were wary of predators survived better than those that weren't. (Actually, it is more complex - animals have a 'flight zone', an area surrounding themselves where they will flee if a predator enters - animals that have too large a zone suffer by interrupting their feeding and mating too often, animals with too small a zone get eaten too often - those that get it just right pass on their genes most effectively.) The presence of a predator triggers the release of adrenaline (or an equivalent hormone) which in turn causes physiological and mental changes that result in instinctive, protective behaviour. The fact that relatively simple creatures such as ants and bees exhibit almost identical collective behaviour to that seen in herd mammals, shoaling fish and flocking birds implies that the evolutionary advantage to a prey species is very high.
Their fear is visceral, but I think panic behaviour is encultured. The young learn to run with the herd ... I think the instinct is to stick with mother, to follow the herd and consequently react as the herd reacts ... and panic is part of that.
How much is leaned behaviour and how much is instinct is a moot point. Unless you can enter the mind of a gnu and trace its thoughts, you cannot know for certain. However, again, the fact that the same behaviour is displayed across species, geography and environment, implies that there is a strong instinctive drive rather than a localised, learned response at play.
Attributing human emotions to animals is always shaky. They certainly produce hormones and their brains function in the same way as ours - however, the vastly larger cerebral cortex of hominids means that we are capable of analysing our feelings and learning to avoid those we find unpleasant. Zebras do not, as far as I have heard, become more risk-averse and wary of lions or cheetahs after a close call, or after seeing a herd member disemboweled in front of them - they react to the immediate threat and then return to their previous behaviour.