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I would disagree....just because there is no recorded evidence of a mass extinctions per Archaeologist, does not mean that a mass extinction did not occur.
Migratory animals navigate our planet as a result of sensory capacities that sense the Earths magnetic field. Despite your contention, given a magnetic pole shift these animals will not go where they are supposed to, ergo the event can have serious ramifications upon the food chain.
Also there is the matter of history and the fact that the "End of Days," just happed to occur at the same time as a magnetic pole shift.
Also, gravity and human comprehension in relation to it is effectively all about a statistical analysis. Based upon what we, have been so far exposed to.
I am referring specifically the the matter of sampling vs. populations, in the context of the efficacy of modern science, In relation to constructs beyond micro-wave ovens, internal combustion engines and the human genome project.
Originally posted by stereologist
reply to post by Kashai
What we do know is that magnetism can be used by animals. It does not mean that it is the sole, or even primary means of navigation. Some migratory species do not always migrate. Canada geese are an example.
Navigation by instinct still requires sensing from the animals. Is it smell, or sight, or temperature, or magnetism, or the location of the Sun, or something else, or a combination of these.
What is known is that extinctions are not related to reversal events.
Based upon what? What percentage of animals that actually lived 780,000 years ago have we actually categorized??? What about animals that ended up dying while living or flying over oceans??
You are basing your conclusions upon life on land. Animals that live and migrate only on land, like for example the Buffalo, are not necessarily applicable in such a context, A vast amount of animals that migrate, travel across hemispheres. They reproduce, feed and get fed upon and are integral to the food chain.