nix scientific name, return None instead

sic name not useful for lookup
find probability of each new bird in popular spots

eBird doesn’t provide all sightings, just number of sightings of each
bird. So to compute probability I took the number of sightings divided
by the max number of sightings (e.g. typically American Robin, Anna’s
Hummingbird in CA). Reports generated only for hotspots with >20
sightings of most common bird.