The ruby-throated one of these can migrate 500 miles while burning off only slightly more than one gram of fat
... 
that hummingbirds put on enough fat in Florida to fly about 650 miles,... [DOC] [TLE] Migration of Birds - Chicago State University [PAR] from the previous revision or only slightly modified to make the discussion 
compatible ... that will ensure sustainability for these populations as they are 
faced with the impacts ...... sand miles.