Staying or Going?

Elaine from Rockport, Texas was "watching both male and female Ruby- throated Hummingbirds on a daily basis for the past several weeks. Seems like most of mine have left as of today. Guess the little cool front we had yesterday had made them move farther south." We wonder: How much longer will these hummers remain?

Q: Is this a male or a female? What species is it? How can you tell?

Photo: Elaine Brackin