The ruby-throated one of these can migrate 500 miles while burning off only slightly more than one gram of fat
Neck could be expected to shut down for most of the .... 
Vista Arizona and I can attest to the fact that these ... 10,000 of the Hummingbirds 
we see are Ruby-throated ... sightings the observers actually got pictures, at least 
one ... survive more than five years while females occasionally.