Annie responded with two photos for the topic “Ephemeral”.
In Philadelphia, she got a 15 foot cobra to “hood” briefly. Caught at a nearly ideal moment.
And a recent eclipse, “ephemeral” by definition. 300mm lens, just begging for a telescope. Astronomical viewing in Chicagoland always gets a lot of light pollution anyhoo.
ParkInkSpot 
That cobra photo is awesome! Nice click!