You can tell the male from the female Ruby Throated Hummingbird by the difference in their throat feathers. The female’s throat feathers are white and the males vary from ruby red to black depending on how the light is shining on them. This young male ruby throated hummer shows the perfect view of its developing red neck feathers. Right now in early autumn he has rows of dark colored dots all over his throat. These dots will slowly turn red until his entire throat is red. In fact you will see the early hatched males with just a spot of red among the dark spots now in September.
This was taken from our second story deck at our home in Southeast Missouri.
Nikon D90 with 18X55mm lens on manual focus