how to identify a swallowtail hummingbird?

Question

how big? what special markings? and anything else you can find

Answer 1

The swallowtail humming bird (Trochilus polytmus), also called the "Doctor Bird", lives only in Jamaica and is one of the most outstanding of the 320 species of humming birds. It is well to note that the beautiful feathers of these birds have no counterpart in the entire bird population and produce iridescent colours characteristic only of that family.

There are pictures of it at these websites:

http://www.jamaicasunrise.com/newtop/in_jamaica.htm

http://photography-on-the.net/forum/showthread.php?t=265122

Answer 2

Picture on this website =>http://www.jis.gov.jm/special_sections/Independence/symbols.html