Rufous Hummingbirds at dusk

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As the light fades and darkness takes over for the night, hummingbirds gater at my feeders in numbers .  It is the only time of day when I will see several birds gathering together on 1 feeder.  They all know that survival to get through the night depends on "filling the tank" with nectar, prior to finding a roosting place , then sleeping through the dark hours in a state of "torper"  Which is pretty close to suspended animation.
​** Female on left and male on right ... Rufous Hummingbirds **

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A final note today about "irridescence"  Unless you are a keen observer of nature you may find this feature confusing.  Some feathers  possess this quality and when the light hits them at a certain angle the feathers light up like neon!   As in the case of hummingbirds , especially the males.  Their beautiful throat feathers when positioned at a sharp angle simply radiate light that looks like an electric current has lit up the feathers.  This is an amazing bit of nature and has useful merit when attracting a female  and also used to intimidate adversaries such as competing males or to scare off other species. 
  * IRRIDESCENCE ... the  quality  of showing many bright colours that change with movement