One of the key sticking points that non-believers like to bring up when criticizing Fortean Zoology is that of “Breeding Population” This is the number of animals which can interbreed freely. It also would, by definition, allow evolutionary change. In other words, this is the number of males and females of a species that is sufficient to reproduce at a rate that would keep the species from extinction.
Within the calculation of Breeding Population is something called Minimum viable population (MVP). This is the lowest number of the population of a species that can survive in the wild. In biology, ecology, and conservation biology, MVP is the smallest possible size at which a biological population can exist without facing extinction from natural disasters or demographic, environmental, or genetic order or plan. This is usually estimated as the population necessary to ensure between 90 and 95 percent probability of survival between 100 to 1,000 years.
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