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Diversity crisis where we re losing 150 species a day. you have an example of how the west nile virus was always around, but how the loss of bio diversity made it lethal. yeah. there s a lot of examples of this. with west nile virus, for example, we it s a virus of mig migratory birds, those birds have been landing on their migration patterns for many years, hundreds of thousands of years. we didn t have west nile virus outbreaks in the united states until 1999. and one reason that might be is because up until recently we had a diversity of bird species in our domestic bird flocks. we had birds like woodpeckers, rails, these diverse bird species were good at repelling west nile virus. what happened over the past 50 years or so, we lost a lot of that avian bio diversity. wood peckers and rails are