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In north america alone there are 46 different species of bats. most of which are small insect eating varieties like the big brown bat and the little brown bat.

Have come from bats. sars, marburg, ebola. so what is it about these creatures and the way they spread pathogens that can be so dangerous? >> the fact bats are carrying viruses is not in and of itself extraordinary. every animal has its normal suite of viruses and bacteria that it normally carries. people do as well. we carry viruses, bacteria, the majority are benign or beneficial, some of which cause disease. it is the fact that bats do tend to carry a higher proportion of viruses that have the ability to infect people. the question is really, why do we see some of these incredibly bad virus...

It became sars kv 2. the virus that calls covid-19. called covid-19 because it emerged in 2019. the new coronavirus was 96.2% similar to a virus taken from a horseshoe bat in 2013. so what does that mean exactly? >> well, 96% is a different virus. so it's a bit like the difference between us and chimpanzees. what it tells us is where the virus probably came from, it means sars covid 2 probably came from bats and probably southern china. >> wuhan is 1,000 miles away from the southern sub tropical regions of hunan province, where dr. xi says the coronaviruses have the greatest risk of jumping fr...

There are actually dozens of varieties of horseshoe bats living in a number places, including the temperate and tropical regions of central europe, africa and asia. in fact there's incredible variety among bat species. they can be found all around the world and every continent except antarctica. however, the diversity and unique abilities of bats is also what makes them tough to contend with when it comes to disease. they're the only mammal capable of actually flying, so they can easily fly and spread viruses to other animals in other communities. >> some migrate thousands of miles, and hence ...

Amazon, would have 100 species of bat. >> the smallest bat in the world, it is this tiny thing that thailand that weighs less than a penny. the biggest bat in the world has more than a six-foot wing span. there is a bat that lives in the cloud forests of ecuador that has the longest tongue of any mammal. it has a tongue that is one and a half times the length of its body. if you stick your arm straight out in front of and you imagine your tongue could touch your fingers, it is three times that long so it can get into a flower to pollinate. >> so relative to its body size, if i stick my arm out...