The Humbird is one of the vvonders of the Countrey, being no bigger than a Hornet, yet hath all the demenſions of a Bird, as bill, and vvings, vvith quills, ſpider-like legges, ſmall clavves: For colour, ſhe is as glorious as the Raine-bovv; as ſhe flies, ſhe makes a little humming noiſe like a Humble-bee: vvherefore ſhee is called the Humbird.
Source: wiktionary