Once upon a time, five billion passenger pigeons spread across the continent in flocks so big that they could block out the sun and spread for hundreds of miles. Then, in just a few decades, they were gone. Now, scientists have found the cause for their devastating decline, and it reveals how fragile even large populations of animals can be. A new study shows that passenger pigeons have existed since the Ice Age in large populations. But as hunting humans came along, they lost their genetic...
from Inhabitat - Green Design, Innovation, Architecture, Green Building https://inhabitat.com/the-rapid-disappearance-of-5-billion-passenger-pigeons-shows-no-population-is-safe-from-extinction
via Inhabitat
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